Sleep calculayor - journaling. drinking caffeine-free tea. 3. Skip naps. If your sleep schedule is out of whack, avoid naps during the day. Napping can make it difficult to go back to sleep at night. Long naps might ...

 
Jun 12, 2021 ... A sleep calculator will suggest the time to fall asleep and the best time to wake up. Most sleep calculators factor in how many sleep cycles you .... Spectrum online tv watch

Having a high-quality mattress is essential if you want to get a good night’s sleep. It ensures you’re suitably comfortable and well-supported, making it easier to fall asleep — an...Kristen Casey, a licensed clinical psychologist and insomnia specialist, tells Sleepopolis that various underlying factors contribute to the habit of popping awake at 3 a.m. “A few include the effects of substances or medications, a misaligned desire for sleep and bed window, poor sleep hygiene, external stimuli such as …When it comes to getting a good night’s sleep, the mattress you choose can make all the difference. With so many mattress options available, it can be overwhelming to decide which ...Millions of people start their day with a caffeinated beverage like coffee or tea, and this is indeed an excellent way to wake up. Caffeine blocks adenosine, a chemical that makes us feel sleepy. Hence, a cup of coffee reduces fatigue and improves focus and concentration. The effects of caffeine can be felt 15 minutes after it's consumed and ...There can be some overlap and transition stages around the ages of 2 and 3 because some toddlers will start dropping naps earlier, while others will need naps longer. But the AASM recommends that ...1. If you're lying awake for more than 30 minutes, it's time to get up. 2. Keep the lights dim. 3. Do something quiet and relaxing before attempting to sleep ...See full list on calculator.net Cut back on screen time starting 2-3 hours before bed. Dim the brightness on your devices. This is often called night mode or dark mode. It changes the background from white to black. Install blue ...The Sleep Debt Calculator is all about sleep deficit – or the aggregate effects of not getting enough rest. The way we calculate sleep debt is by subtracting the amount of sleep we realistically get from the sleep we should get. While acute sleep debt can mostly be erased by a good 8 hours of Zzz’s, a chronic sleep deficit may take a bit ...Calculate Bed Times. The Bed of Your Dreams. Shop Mattress. See why Nectar is the best. (1 min) Sleep Deprivation causes & Symptoms. 25 Hack for better sleep. How to fix your …Aug 17, 2020 · Avoid anything stressful or overly stimulating, like emotional conversations or working. 3. Turn off electronic devices before you go to sleep. Electronic devices like your phone emit blue light ... May 5, 2020 · The best time to sleep and wake up will vary among individuals, but most adults should aim to go to bed between 8 p.m. and midnight and sleep for 7–9 hours. Learn more here. Our sleep time calculator accounts for 15 minutes of sleep latency, also known as the time needed to nod off. Read on to find out what sleep cycles are, their …This sleep calculator is designed to help you wake up during Stage 1, which is where your lightest rest occurs. There are three ways to use this calculator to generate your custom …Get started. Sleep Cycle premium. Sleep impacts your organization. Find out what you can do about it. We want to help the world to better sleep. By using Sleep Cycle to track your sleep and find your perfect wake up window, we believe you’ll be part of that change, for the benefit of better health.You can use the Sleep Debt Calculator by regularly inputting the amount of sleep you get each night. The calculator will track your sleep patterns over time and calculate your average sleep debt. With this information, you can make informed decisions about adjusting your sleep schedule, bedtime routines, and habits to reduce your sleep debt and ...Avoid caffeinated beverages (coffee, many teas, chocolate, and some soft drinks) after 1 or 2 p.m.—or altogether, if you're especially caffeine-sensitive. Get regular exercise. Aerobic exercise such as walking, jogging, or swimming can help you fall asleep faster, get more deep sleep, and awaken less often during the night.Oct 10, 2023 ... Trending · To get up at 6am - go to bed by 8.46pm, 10.16pm, 11.46pm or 1.16am · To get up at 7am - go go to bed by 9.46pm, 11.16pm, 12.46am or .... The best way to figure out what time you should sleep is to work backward. Take the time you plan to wake up (say, 6 a.m.) and subtract the recommended 7 to 9 hours of sleep (which is around 9 to 11 p.m. the night before). This is your bedtime ballpark. To hone it down further, there are other individual factors to consider — age, genetics ... Mar 24, 2022 · The light–dark cycle influences when your brain makes and releases a hormone called melatonin. Melatonin travels to the cells in your body through your bloodstream. The amount of melatonin in your bloodstream starts to increase in the evening and peaks in the early morning. Melatonin is thought to promote sleep. Bedtime sleep calculator to find your perfect sleep or wake time. Feel rested and refreshed, every morning! The best way to figure out what time you should sleep is to work backward. Take the time you plan to wake up (say, 6 a.m.) and subtract the recommended 7 to 9 hours of sleep (which is around 9 to 11 p.m. the night before). This is your bedtime ballpark. To hone it down further, there are other individual factors to consider — age, genetics ... How to Calculate REM Sleep? To calculate your REM Sleep, use the following code: REM Sleep = (Total Sleep Time / Sleep Cycle Time) * REM Sleep Time. It’s that simple! REM Sleep is calculated by dividing the total sleep time by the sleep cycle time, and then multiplying the result by the amount of time spent in REM sleep.A number of sleep disorders may contribute to the conditions that can lead to hypnagogic and hypnopompic hallucinations, or be related to them. They include: Obstructive sleep apnea, which causes breathing difficulties while sleeping. Restless legs syndrome, which causes leg discomfort and motion while sleeping.Avoid caffeine, alcohol, and large or heavy meals close to bedtime. Keep your sleeping area dark, quiet, and at a comfortable temperature. Implement a regular …JALL – Best Wake Up Light. While vibrating and loud noises are enough for most deep sleepers, a bright light is sometimes the best wake-up call. The JALL simulates sunrise and will begin to light up from 10 to 30 minutes before your alarm goes off. It comes in seven colors with 20 brightness levels.A REM sleep calculator is a tool that can help individuals better understand their sleep patterns by calculating the amount of time spent in REM sleep during a typical sleep cycle. Here are a few steps to use a REM sleep calculator: Determine your typical sleep cycle length: The first step to using a REM sleep calculator is to determine the ...Sleep Calculation Formula. The Sleep Calculation Formula is a mathematical formula that determines the ideal amount of sleep needed by an individual. It is based on the time spent in deep and light sleep during a sleep cycle. The formula is as follows: Ideal Sleep Time = (2 x (Time Spent in Deep Sleep) + 4 x (Time Spent in Light Sleep)) / 6The sleep-wake rhythm is a key one because physiological processes such as the production of appetite hormones, digestion, and even the immune system are designed to activate when we’re awake ...Nov 22, 2023 · New research suggests that having a consistent sleep schedule may actually be more important than getting eight hours of sleep every night. Having a consistent sleep and wake time allows your internal circadian rhythm to operate more efficiently, helping you to fall asleep faster and stay asleep. To improve consistency, plan your sleep schedule ... The REM-Fit sleep calculator helps you plan your sleep and wake up times to work with the proper sleep cycles. This allows you to get better rest and ...Sleep Calculation Formula. The Sleep Calculation Formula is a mathematical formula that determines the ideal amount of sleep needed by an individual. It is based on the time spent in deep and light sleep during a sleep cycle. The formula is as follows: Ideal Sleep Time = (2 x (Time Spent in Deep Sleep) + 4 x (Time Spent in Light Sleep)) / 6For growing children, the body is putting nutrients ingested to work building bones, connective tissues, and muscles. Until a child is age 6 and above, at least 12 hours of sleep a day is a good idea. If you need to get your child up and moving at 7 a.m., a 7 p.m. bedtime may be necessary.Mar 5, 2024 · Sleep Calculator: What Time Should I Go To Bed? Using the sleep calculator, you can easily tell it when you want to wake up and it will show you a variety of times to fall asleep and how many sleep cycles you will achieve. Keep scrolling for our wake calculator! Aerobic exercise in the morning or afternoon stimulates earlier melatonin release and shifts the circadian rhythm forward. For people who exercise outdoors, morning exercise may have the added benefit of exposure to sunlight. This helps stabilize circadian rhythms and makes it easier to fall asleep early.Let’s face it — anything you can do to save time during your morning routine is a plus, especially if it allows you to get other things accomplished or even sleep in a little longe...You may develop a condition that affects your sleep and causes a 3 a.m. wake-up. Some of these conditions include: Sleep apnea: This condition causes you to stop breathing during your sleep ...Philips SmartSleep Sleep and Wake-Up Light is designed to help you wake up refreshed after a productive night’s sleep. It combines the benefits of a Wake-up Light with RelaxBreathe, a guided wind-down-to-sleep feature that helps calm your body and mind – and offers extensive app-enabled customization for …Oct 23, 2020 · REM. Stage 4. REM Sleep. 10-60 minutes. In stage 1, you’ve just dozed off and started transitioning to stage 2, which involves further slowing of activity in the brain and body. It’s much easier to be awoken during these early stages of the sleep cycle. Stage 3 is the deepest part of NREM sleep. In this stage, your muscles and body relax ... JALL – Best Wake Up Light. While vibrating and loud noises are enough for most deep sleepers, a bright light is sometimes the best wake-up call. The JALL simulates sunrise and will begin to light up from 10 to 30 minutes before your alarm goes off. It comes in seven colors with 20 brightness levels.If you head to bed right now, what time would you have to wake up to feel refreshed? The science says 5 to 6 sleep cycles per night is optimal. Use this sleep calculator to figure …When it comes to getting a good night’s sleep, the mattress you choose can make all the difference. With so many mattress options available, it can be overwhelming to decide which ...The total sleep time is your total time in bed (in minutes) minus how many minutes it took you to fall asleep and minus how many minutes you spent awake during ...Try My Sleep Calculator, an all-in-one web tool that breaks down the complexities of getting a balanced restful sleep each night.App enabled customization. Through the SleepMapper app, Philips Connected Sleep and Wake Up Light offers you the ability to control your light and personalize your experience. You can set an advanced weekday or weekend alarm with the Advanced Alarm Scheduler that offers 20 different sounds, lights, and intensity …Sleep calculator – Example with bedtime and wake up time So for example, for a healthy 18-60-year-old adult who feels rested, refreshed and ready for the day after 7.5 hours of sleep, a sleep calculator would look something like this (always allowing at least 15-20 minutes to fall asleep and taking into account the awakening window from Sleep ...Philips SmartSleep Sleep and Wake-Up Light is designed to help you wake up refreshed after a productive night’s sleep. It combines the benefits of a Wake-up Light with RelaxBreathe, a guided wind-down-to-sleep feature that helps calm your body and mind – and offers extensive app-enabled customization for …A sleep calculator is your personal sleep guidance tool. It is a calculator designed to help you find the perfect bedtime and wake-up time based on your unique sleep cycles and …Getting a good night’s sleep is essential for our overall health and well-being. But if you’re not sleeping on the right bedding, you may be missing out on the best sleep of your l...The ESP32 Light Sleep Mode is very similar to the Modem Sleep Mode. However, the only difference is that in light sleep mode, the CPUs are stalled (clock-gated) as well as most of the RAM, and the digital peripherals. Their supply voltage is also reduced in order to save more power. ESP32 Light Sleep Mode Current Consumption is: ~0.8mA.You can use the Sleep Debt Calculator by regularly inputting the amount of sleep you get each night. The calculator will track your sleep patterns over time and calculate your average sleep debt. With this information, you can make informed decisions about adjusting your sleep schedule, bedtime routines, and habits to reduce your sleep debt and ...Take melatonin supplements to “reset your circadian rhythm.”. Second on the list is a controversial sleep aid that comes with both pros and cons. “ Melatonin supplements are often marketed as sleep aids, but melatonin is more of a sleep regulator than a sleep initiator,” Dr. Daidone explains. “It can help signal to your body that it's ...Daylight Saving Time (DST) is the yearly practice of setting clocks forward one hour Trusted Source American Academy of Sleep Medicine (AASM) AASM sets standards and promotes excellence in sleep medicine health care, education, and research. View Source between the months of March and November. The idea behind DST is to …Sleep Calculator. This online sleep calculator will help you to find out the best time to wake up feeling refreshed and alert if you want to fall asleep at a specified time. The calculator works by counting forwards in sleep cycles. Each cycle typically lasts about 90 minutes and repeats several times over the course of a night.There are multiple potential causes of nighttime awakenings. It is normal to wake up as part of transitions between cycles of sleep stages. It is necessary to wake to change positions, roll over, or adjust the covers. Noises in the environment should normally prompt waking to ensure safety. Parents of young children often wake to attend to ...If you’re in the market for a new mattress, look no further than WG&R Sleep Shop. With a wide selection of mattresses and knowledgeable staff, they are your one-stop-shop for all t...Nov 8, 2023 · Exercise Regularly. Frequent exercise has many health benefits, including better quality sleep. Studies have found that regular exercise can help people fall asleep quicker and sleep longer, which may help them wake up feeling more refreshed. Sleep experts recommend exercising most days for at least 30 minutes . JALL – Best Wake Up Light. While vibrating and loud noises are enough for most deep sleepers, a bright light is sometimes the best wake-up call. The JALL simulates sunrise and will begin to light up from 10 to 30 minutes before your alarm goes off. It comes in seven colors with 20 brightness levels.Nov 22, 2023 · New research suggests that having a consistent sleep schedule may actually be more important than getting eight hours of sleep every night. Having a consistent sleep and wake time allows your internal circadian rhythm to operate more efficiently, helping you to fall asleep faster and stay asleep. To improve consistency, plan your sleep schedule ... วิธีคำนวณเวลานอนง่ายๆ ที่จะทำให้การตื่นนอนทุกเช้าสดชื่นไม่ว่าจะนอนดึกแค่ไหนก็ตาม ค้นหาช่วงเวลาเข้านอน - ตื่นนอน ที่เหมาะสมที่ โดยไม่ ...Dr. Brues, the sleep doctor, has outlined the ideal sleep and wake times for each chronotype based on the number of sleep cycles each typically needs. 🔹Bears Wake up: 7 am, Sleep: 11 pm. 🔹Lions Wake up: 5:30 am, Sleep: 9:30 pm. 🔹 Wolves Wake up: 7:30 am, Sleep: 12 am. 🔹Dolphins Wake up: 6:30 am, Sleep: …Sleep Calculator. We have developed an easy-to-use sleep calculator. Simply select the following from the drop down menu: Whether you wish to change the time you sleep or the time you wake. The desired time you wish to sleep or wake. The time you currently wake. The time you currently fall asleep. A customized schedule will be generated for you ...Calculate the average by adding up the total hours and dividing it by the number of nights. Identify the recommended sleep duration: The sleep debt calculator will require you to input the recommended sleep duration for your age group. Generally, adults require around seven to nine hours of sleep per night, while younger individuals may …Sometimes conditions such as depression, sleep apnea or restless legs syndrome cause sleep problems. Establish a routine. Maintain regular times for eating, waking up and going to bed. Avoid stimulants. Alcohol, caffeine and nicotine can interfere with sleep. Limit use of these substances, especially at night.Dr. Brues, the sleep doctor, has outlined the ideal sleep and wake times for each chronotype based on the number of sleep cycles each typically needs. 🔹Bears Wake up: 7 am, Sleep: 11 pm. 🔹Lions Wake up: 5:30 am, Sleep: 9:30 pm. 🔹 Wolves Wake up: 7:30 am, Sleep: 12 am. 🔹Dolphins Wake up: 6:30 am, Sleep: …Are you looking for a new mattress, but don’t know where to start? Whether you’re just not getting the sleep you need, or you’re feeling like your old one is just not providing the...Sleep Calculator. We have developed an easy-to-use sleep calculator. Simply select the following from the drop down menu: Whether you wish to change the time you sleep or the time you wake. The desired time you wish to sleep or wake. The time you currently wake. The time you currently fall asleep. A customized schedule will be generated for you ...Sleepcalc a sleep calculator · It takes the average human about 15 minutes to fall asleep · A good night's sleep consists of 5-6 complete sleep cycles (or a 4-5&n...By keeping a record of sleep, the diary makes it possible to calculate total sleep time. A sleep record also helps people identify sleep disruptions and other factors that can influence sleep quality. Identifying the habits that affect sleep can show patterns and help explain sleeping problems. For health care providers, the concrete entries in ...Bedtime sleep calculator to find your perfect sleep or wake time. Feel rested and refreshed, every morning!Fatigue. “Foggy brain,” and difficulty with memory and focus. Compromises to the immune system, increased inflammation, and greater vulnerability to illness, disease, and other effects of ...Foxes typically sleep in dens, especially when they have their young. There are exceptions of course, as some males will sleep in the open when it is mating season. Often, foxes wi...You can use the Sleep Debt Calculator by regularly inputting the amount of sleep you get each night. The calculator will track your sleep patterns over time and calculate your average sleep debt. With this information, you can make informed decisions about adjusting your sleep schedule, bedtime routines, and habits to reduce your sleep debt and ...JALL – Best Wake Up Light. While vibrating and loud noises are enough for most deep sleepers, a bright light is sometimes the best wake-up call. The JALL simulates sunrise and will begin to light up from 10 to 30 minutes before your alarm goes off. It comes in seven colors with 20 brightness levels.The ESP32 Light Sleep Mode is very similar to the Modem Sleep Mode. However, the only difference is that in light sleep mode, the CPUs are stalled (clock-gated) as well as most of the RAM, and the digital peripherals. Their supply voltage is also reduced in order to save more power. ESP32 Light Sleep Mode Current Consumption is: ~0.8mA.PJ Bear explains snoring, dreams, nightmares, sleep disorders and problems. Games and puzzles are included to help your child learn more about sleep for kids.The total sleep time is your total time in bed (in minutes) minus how many minutes it took you to fall asleep and minus how many minutes you spent awake during ...The total sleep time is your total time in bed (in minutes) minus how many minutes it took you to fall asleep and minus how many minutes you spent awake during ...Dec 8, 2023 · If you think you’re getting poor sleep, consider whether you possess any of these tell-tale signs: You take more than 30 minutes to fall asleep after you get into bed. You regularly wake up more than once per night. You lie awake for more than 20 minutes when you wake up in the middle of the night. You spend less than 85 percent. Use our sleep cycle calculator to estimate the best time for you to wake up and go to bed. You will be given multiple results based on your age as well as your goal wake time or bedtime. The results are broken down to optimize your REM and non-REM sleep cycles. Your need for sleep changes with age. Getting a good night's sleep is about more than simply going to bed early – it's about waking up at the right time too. Using a formula based on the body's natural rhythms, the Sleep Calculator will work out the best time for you to rise or go to sleep. And that means you can look forward to feeling fresh and alert … every morning.Dr. Brues, the sleep doctor, has outlined the ideal sleep and wake times for each chronotype based on the number of sleep cycles each typically needs. 🔹Bears Wake up: 7 am, Sleep: 11 pm. 🔹Lions Wake up: 5:30 am, Sleep: 9:30 pm. 🔹 Wolves Wake up: 7:30 am, Sleep: 12 am. 🔹Dolphins Wake up: 6:30 am, Sleep: …Sleep Calculator. Find your optimal sleep time to wake up refreshed, energized and ready for peak performance! If you go to sleep right now, you should try to wake up at one of the following times: 9:14 AM or 10:44 AM …Think of circadian rhythms as your body's biological clock—any disruption can affect sleep and overall health. These natural rhythms rise and fall in a 24-hour cycle, drive physical and mental changes, and affect behavior. Circadian rhythms prompt us to sleep at night and wake up in the morning.Download the Sleep Cycle app today for the easiest way to get a good night's sleep. √ Sleep analysis with Sleep Cycle patented sound technology or accelerometer. √ Fully integrated with Apple Health, exchanging sleep analysis. √ Customizable wake-up window. From instant (regular alarm clock), up to 45 minutes.We are your personal sleep coach, ready to inform, inspire, and guide you on the path to better sleep. As the leader in digital sleep health, we aim to be a trusted and comprehensive companion for you on your journey to healthy sleep habits. Let us help you take charge of your health and get the sleep you need and deserve.

Feb 17, 2024 ... You go through three stages during sleep: light, deep, and REM sleep. Experts tend to recommend seven to nine hours of sleep for adults, which .... Team hub

sleep calculayor

The sleep calculator, also referred to as the sleep cycle calculator is a great tool that generates the complete sleep cycle for your waking time. The sleep time calculator calculates the time to wake up at the end of a sleep cycle and the sleeping time as well. It provides the sleeping time slabs with one, two, three, four, five, and six sleep ...Sleep Calculator. This online sleep calculator will help you to find out the best time to wake up feeling refreshed and alert if you want to fall asleep at a specified time. The calculator works by counting forwards in sleep cycles. Each cycle typically lasts about 90 minutes and repeats several times over the course of a night.Calculate the average by adding up the total hours and dividing it by the number of nights. Identify the recommended sleep duration: The sleep debt calculator will require you to input the recommended sleep duration for your age group. Generally, adults require around seven to nine hours of sleep per night, while younger individuals may …Morning light can increase alertness and be a pretty effective antidepressant. “It’s a strong signal to your circadian system,” Burgess says. “It’s probably the most beneficial light we ...Update: Some offers mentioned below are no longer available. View the current offers here. Amtrak is running a new BOGO promotion on sleeper cars, where you'... Update: Some offers...You may develop a condition that affects your sleep and causes a 3 a.m. wake-up. Some of these conditions include: Sleep apnea: This condition causes you to stop breathing during your sleep ...Many people struggle to get quality sleep during the summer months. As the temperatures outside rise, so do temperatures inside, and that makes sleeping at night very uncomfortable...Sleep Calculator. Find your optimal sleep time to wake up refreshed, energized and ready for peak performance! If you go to sleep right now, you should try to wake up at one of the following times: 9:14 AM or 10:44 AM …Avoid caffeine, alcohol, and large or heavy meals close to bedtime. Keep your sleeping area dark, quiet, and at a comfortable temperature. Implement a regular …Discover benefits of light therapy and how sleep and wake-up lights and energy lights can help you fall asleep fast, wake up naturally, and improve your mood and energy during the day. Free shipping on orders over $25. 2-5 business day delivery. Easy Returns. Sign up and save. Products. Main menu. Products. Personal care.JALL – Best Wake Up Light. While vibrating and loud noises are enough for most deep sleepers, a bright light is sometimes the best wake-up call. The JALL simulates sunrise and will begin to light up from 10 to 30 minutes before your alarm goes off. It comes in seven colors with 20 brightness levels.Sleep calculator – Example with bedtime and wake up time So for example, for a healthy 18-60-year-old adult who feels rested, refreshed and ready for the day after 7.5 hours of sleep, a sleep calculator would look something like this (always allowing at least 15-20 minutes to fall asleep and taking into account the awakening window from Sleep ...Recommended Sleep Guidelines Based on Age · Birth to 3 months: 14 to 17 hours · 4 to 11 months: 12 to 16 hours · 1 to 2 years: 11 to 14 hours · 3 to 5 y...Waking up at the same time each morning can help you sleep better at night—and make it easier to get out of bed in the morning. Your body clock, or circadian rhythm, is the system that regulates ...Tap Browse at the bottom right, then tap Sleep. Scroll down to Your Schedule, then tap Edit (below Next). Turn off Alarm. Tap Done. After your next wake up time, your normal alarm resumes. Note: You can also use the Clock app to change your next sleep schedule alarm. See also Set up a Sleep Focus schedule in Health on …May 13, 2023 · Teens should try to go to bed between 9:00 and 10:00 p.m. Adults should try to go to sleep between 10:00 and 11:00 p.m. Despite age and sleep need, having a consistent wake time, even on the weekends, is important for better sleep . Schedules, wake times, and even sleep needs can shift, so it helps to remain flexible. We are your personal sleep coach, ready to inform, inspire, and guide you on the path to better sleep. As the leader in digital sleep health, we aim to be a trusted and comprehensive companion for you on your journey to healthy sleep habits. Let us help you take charge of your health and get the sleep you need and deserve.Click and switch to the Power Management tab at the top. Check the box for Allow this device to wake up the computer at the top. If this option is already checked, uncheck it, and click OK. Now double-click the device and re-enable Allow this device to wake up the computer. Once done, restart your PC for good measure.Thanks to experts’ research on the average adult sleep cycle of 90-120 minutes, you can determine when YOU should hit the hay! To ensure you get enough restorative slumber every night – irrespective of workdays or weekends – try setting regular wake up/sleep times tailored around daylight hours. Keep an eye open during sunlit windows and ...Sleep Debt Calculator. The Sleep Debt Calculator is a powerful tool designed to help you assess your sleep patterns and determine if you are getting adequate rest based on your age group. Quality sleep is essential for overall well-being, and this calculator empowers you to make informed decisions about your sleep habits. It tells you the best times to go to bed or wake up based on when you want to rise. The calculator uses the idea that sleep cycles last about 90 minutes and that it takes approximately 15 minutes to fall asleep. What is a Sleep Cycle? A sleep cycle is the pattern of a 90-minute period marked by sleep and wakefulness that repeats throughout the ... .

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