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     alamy.com

     • Your central circadian clock, located in your brain, tells you when it is time for sleep. Other circadian clocks are in organs throughout your body. Your body’s internal clocks are in sync with certain cues in the environment. Light, darkness, and other cues help determine when you feel awake and when you feel drowsy.
     www.nhlbi.nih.gov/health/sleep/sleep-wake-cycle

     How Sleep Works - Your Sleep/Wake Cycle - NHLBI, NIH

2. People also ask

   What happens if you wake up during deep sleep?

   • If a person wakes during deep sleep, they may feel mentally foggy for around 30–60 minutes. The overall percentage of deep sleep tends to decrease with age. The last stage of the sleep cycle is REM sleep. The term “REM” refers to a person’s eye movements. During this stage, the eyes move quickly and rapidly from side to side.

   Sleep cycle stages: Chart, durations, and how to improve sleep

   www.medicalnewstoday.com/articles/sleep-cycle-stages

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   What happens if you stay awake for 24 hours?

   • Staying awake for 24 hours may cause symptoms like: When you miss 36 hours of sleep, your symptoms become more intense. You’ll have an overwhelming urge to sleep. You may start to have microsleeps, or brief periods of sleep, without realizing it. A microsleep usually lasts up to 30 seconds.

   Sleep Deprivations Stages: The 5 Stages and What They Mean - Healthli…

   www.healthline.com/health/sleep-deprivation/sleep-deprivation-stages

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   How many hours a night should you sleep?

   • Adequate and restful sleep is the cornerstone of overall well-being. Aim for seven to nine hours of uninterrupted sleep each night, allowing your body to traverse the essential stages of NREM and REM sleep. Create a conducive sleep environment, maintain a consistent sleep schedule, and heed the signals of your body and mind.

   4 Stages of Sleep: NREM, REM, and the Sleep Cycle - Verywell Health

   www.verywellhealth.com/the-four-stages-of-sleep-2795920

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   How do you know if your sleep is interrupted?

   • For many people, the central symptom of interrupted sleep is easily noticeable: waking up from sleep one or more times during the course of the night (or during the day for people who work a night shift). The timing and length of these wakeful episodes can vary. A person may have only a few breaks in sleep or several.

   Interrupted Sleep: Causes & Helpful Tips - Sleep Foundation

   www.sleepfoundation.org/sleep-deprivation/interrupted-sleep

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   How much sleep do you need a day?

   • Adults need about 7 to 8 hours of sleep each night. But sometimes, work and lifestyle factors may disrupt your ability to sleep. When you get less sleep than needed or no sleep at all, it’s called sleep deprivation. For most people, a short bout of sleep deprivation isn’t a cause for concern.

   Sleep Deprivations Stages: The 5 Stages and What They Mean - Healthli…

   www.healthline.com/health/sleep-deprivation/sleep-deprivation-stages

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   How long do you wake up after a sleep apnea?

   • The timing and length of these wakeful episodes can vary. A person may have only a few breaks in sleep or several. They may be awake for just a few minutes or for an extended period before transitioning back to sleep. A person may experience restless sleep, tossing and turning or feeling only half-asleep without drifting off into deeper rest.

   Interrupted Sleep: Causes & Helpful Tips - Sleep Foundation

   www.sleepfoundation.org/sleep-deprivation/interrupted-sleep

   See all results for this question

3. www.medicalnewstoday.com › articles › sleep-cycle-stagesSleep cycle stages: Chart, durations, and how to improve sleep

   www.medicalnewstoday.com › articles › sleep-cycle-stages

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   Nov 30, 2020 · Stage one begins when a person shifts from wakefulness to sleep. It is a period of light non-REM sleep that slows down a person’s heart rate, breathing, eye movements, and brain waves.

4. www.sleephealth.org › sleep-health › importance-ofUnderstanding Sleep Cycles And Stages - SleepHealth

   www.sleephealth.org › sleep-health › importance-of

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   Understanding Sleep Stages. Sleep is a complex process that occurs in stages, and we cycle in and out of these stages during the night. The two main components of normal sleep are REM (rapid eye movement) sleep, when the most vivid dreaming occurs, and non-REM sleep (NREM).

5. www.healthline.com › health › sleep-deprivationSleep Deprivations Stages: The 5 Stages and What They Mean

   www.healthline.com › health › sleep-deprivation

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   Feb 15, 2023 · The 5 Stages of Sleep Deprivation. Timeline. Recovery. Treatments. Lifestyle tips. See a doctor. Takeaway. Sleep deprivation can occur after just 24 hours of no sleep. However, the longer you...

6. www.nhs.uk › conditions › insomniaInsomnia - NHS

   www.nhs.uk › conditions › insomnia

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   Check if you have insomnia. You have insomnia if you regularly: find it hard to go to sleep. wake up several times during the night. lie awake at night. wake up early and cannot go back to sleep. still feel tired after waking up. find it hard to nap during the day even though you're tired.

7. www.verywellhealth.com › the-four-stages-of-sleepThe 4 Stages of Sleep - Verywell Health

   www.verywellhealth.com › the-four-stages-of-sleep

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   Aug 8, 2024 · During stage 1 sleep: Your brain slows down. Your heartbeat, your eye movements, and your breathing slow with it. Your body relaxes, and your muscles may twitch. This brief period of sleep lasts for around five to 10 minutes.

   • Author: Kendra Cherry

8. www.sleepfoundation.org › sleep-deprivationInterrupted Sleep: Causes & Helpful Tips - Sleep Foundation

   www.sleepfoundation.org › sleep-deprivation

   • Cached

   Mar 12, 2024 · Key Takeaways. Interrupted sleep involves frequent awakenings during the night, disrupting the sleep cycle. Effects include daytime sleepiness, cognitive decline, mood disturbances, and health risks. Factors unique to the individual’s situation can interrupt sleep, like age, stress, and lifestyle.

9. www.sleepfoundation.org › stages-of-sleep › rem-sleepREM Sleep: What It Is and Why It’s Important - Sleep Foundation

   www.sleepfoundation.org › stages-of-sleep › rem-sleep

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   Mar 22, 2024 · REM sleep is characterized by relaxed muscles, quick eye movement, irregular breathing, elevated heart rate, and increased brain activity. Most adults need about two hours of REM sleep each night. REM sleep plays a role in memory consolidation, emotional processing, brain development, and dreaming.