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  2. Dictionary

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    sleep
    [slēp]
    noun
    sleep (noun)
    1. a condition of body and mind that typically recurs for several hours every night, in which the eyes are closed, the postural muscles relaxed, the activity of the brain altered, and consciousness of the surroundings practically suspended:
      "I was on the verge of sleep" · "he talked in his sleep" · "a good night's sleep" · "the effects of sleep loss"
      • literary
        a state compared to or resembling sleep, such as death or complete silence or stillness:
        "a photograph of the poet in his last sleep"
    2. a gummy or gritty secretion found in the corners of the eyes after sleep:
      "she sat up, rubbing the sleep from her eyes"
    verb
    sleep (verb) · sleeps (third person present) · slept (past tense) · slept (past participle) · sleeping (present participle)
    1. be in a state of sleep; be asleep:
      "she slept for half an hour"
      Similar:
      doze
      rest
      nap
      catnap
      drowse
      slumber
      be asleep
      take a siesta
      take a nap
      sleep like a log/top
      be in the arms of Morpheus
      Opposite:
      wake up
      • (sleep through)
        fail to be woken by:
        "he was so tired he slept through the alarm"
      • be inactive or dormant:
        "Copenhagen likes to be known as the city that never sleeps"
      • literary
        be at peace in death; lie buried:
        "he sleeps beneath the silver birches"
    2. provide (a specified number of people) with beds, rooms, or places to stay the night:
      "studios sleeping two people cost $70 a night"
    Origin
    Old English slēp, slǣp (noun), slēpan, slǣpan (verb), of Germanic origin; related to Dutch slapen and German schlafen.
    Translate sleep to
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  3. People also ask
    What are some chronic diseases and conditions that can be caused by not getting enough sleep?Not getting enough sleep is linked with many chronic diseases and conditions—such as type 2 diabetes, heart disease, obesity, and depression—that threaten our nation’s health. Not getting enough sleep can lead to motor vehicle crashes and mistakes at work, which cause a lot of injury and disability each year.

    Sleep and Sleep Disorders | CDC

    cdc.gov
    What are the different stages of sleep?Sleep in humans consists of four sleep stages: rapid eye movement (REM) sleep, and three non-rapid eye movement (NREM) sleep stages. Dreams can happen in any sleep stage. It is a popular misconception that dreams only occur during REM sleep.

    How Long Are Dreams? | Sleep Foundation

    sleepfoundation.org
    What are the consequences of not getting enough sleep?Not getting enough sleep is linked to many adverse effects, including impaired focus and decision-making and an increased risk of heart disease, obesity, diabetes, and Alzheimer’s. Everyone has unique needs and preferences, and individual sleep requirements are no different.

    How Many Hours of Sleep Do You Really Need? - Healthline

    healthline.com
    What are the benefits of sleep?Sleep is a powerful stress-reliever. It improves concentration, regulates mood, and sharpens judgment and decision-making. A lack of sleep not only reduces mental clarity but our ability to cope with stressful situations. This is due, in part, to the impact of chronically high levels of cortisol.

    Why Do We Need Sleep? | Sleep Foundation

    verywellhealth.com
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  4. Content
    What is Sleep and Why Do We Need It?

    What is Sleep and Why Do We Need It?

    Sleep cycle infographics education diagram Vector Image
    Organizing and summarizing search results for you

    Sleep is a natural process that allows the body and brain to rest and recover, and it involves changes in brain activity, physiology, and behavior that serve various functions and benefits for health and well-being. 1 9 3

    Some of the basic concepts related to sleep are:

    • Sleep phases: Sleep can be divided into two major phases: non-rapid eye movement (NREM) sleep and rapid eye movement (REM) sleep. Each phase has distinct characteristics and functions in the sleep cycle. 9 3 9
    • Sleep cycle: A sleep cycle is a period of time that includes different stages of sleep. Each cycle lasts about 90 to 120 minutes and repeats four to six times per night. The stages of sleep are NREM stage 1, NREM stage 2, NREM stage 3, and REM stage. 1 3
    • Circadian rhythm: Circadian rhythm is the body's internal clock that regulates the timing of sleep and wakefulness. Circadian rhythm is influenced by light exposure, hormones, and other factors. 1 2 4
    • Sleep functions: Sleep affects nearly every aspect of our physical and mental health, from mood and memory to immunity and metabolism. Getting enough quality sleep is vital for our overall well-being and functioning. 11 13 12 4
    Based on 10 sources:
    Merriam Webster
    https://www.merriam-webster.com/dictionary/sleep
    Sleep Definition & Meaning - Merriam-Webster
    The meaning of SLEEP is the natural, easily reversible periodic state of many living things that is marked by the absence of wakefulness and by the loss of consciousness of one's s…
    Wikipedia
    https://en.wikipedia.org/wiki/Sleep
    Sleep - Wikipedia
    Sleep is a state of reduced mental and physical activity in which consciousness is altered and certain sensory activity is inhibited. During sleep, there is a marked decrease in mu…
    1
    Harvard University
    2
    Sleep Foundation
    3
    sleepdoctor.com
    + 5 more
    Harvard University
    https://sleep.hms.harvard.edu/education-training/public-education/sleep-and-health-education-program/sleep-health-education-47
    1
    Science of Sleep: What is Sleep? | Sleep Medicine - Harvard University
    From observing changes in behavior and responsiveness, scientists have noted the following characteristics that accompany and in many ways define sleep: Sleep is a period of reduce…
    Sleep Foundation
    https://www.sleepfoundation.org/how-sleep-works/sleep-dictionary
    2
    Sleep Dictionary: Definitions of Common Sleep Terms | Sleep Foundation
    Sleep Dictionary: Definitions of Common Sleep Terms | Sleep Foundation · / How Sleep Works / Sleep Dictionary · Sleep Dictionary · Updated December 18, 2023 · Eric Suni Staff Write…
    sleepdoctor.com
    https://sleepdoctor.com/how-sleep-works/what-is-sleep/
    3
    What Is Sleep? Why, When, and How Our Bodies Rest - Sleep Doctor
    Sleep is a vital natural process that allows the body and mind to rest and recover. The sleep cycle consists of distinct stages, including NREM and REM sleep, each with a specific …
    clevelandclinic.org
    https://my.clevelandclinic.org/health/body/12148-sleep-basics
    4
    Sleep: What It Is, Why It’s Important, Stages, REM & NREM
    Overview. What is sleep? Sleep is a normal body process that allows your body and brain to rest. At first glance, sleep is deceptively simple. For most people, it’s just a matter o…
    National Institutes of Health (NIH)
    https://www.ncbi.nlm.nih.gov/books/NBK482512/
    9
    Physiology of Sleep - StatPearls - NCBI Bookshelf
    Physiology of Sleep - StatPearls - NCBI Bookshelf · Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation · Bookshelf · Browse Titles · Advanced · Help · Disclaime…
    Sleep Foundation
    https://www.sleepfoundation.org/how-sleep-works/benefits-of-sleep
    11
    8 Health Benefits of Sleep
    8 Health Benefits of Sleep · / How Sleep Works / 8 Health Benefits of Sleep · 8 Health Benefits of Sleep · Updated February 29, 2024 · Jay Summer Staff Writer · Dr. Abhinav Singh S…
    National Institutes of Health (NIH)
    https://www.nhlbi.nih.gov/health/sleep/why-sleep-important
    12
    How Sleep Works - Why Is Sleep Important? | NHLBI, NIH
    How Sleep Works - Why Is Sleep Important? | NHLBI, NIH · Home · Health Topics · How Sleep Works · Why Is Sleep Important? · How Sleep Works · Why Is Sleep Important? · Español · IN…
    Sleep Foundation
    https://www.sleepfoundation.org/how-sleep-works/why-do-we-need-sleep
    13
    Why Do We Need Sleep?
    Why Do We Need Sleep? · / How Sleep Works / Why Do We Need Sleep? · Why Do We Need Sleep? · Updated April 5, 2024 · Lucy Bryan Contributing Writer · Dr. Brandon Peters Sleep Physic…
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