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1. Dictionary

   sleep

   /sliːp/

   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"
   • ▪ a state compared to or resembling sleep, such as death or complete silence or stillness: literary "a photograph of the poet in his last sleep"
   • ▪ (typically in the context of anticipating a forthcoming event) a night, or a night's sleep: informal "two more sleeps till I fly to LA"
   • 2. a gummy secretion found in the corners of the eyes after sleep: "she sat up, rubbing the sleep from her eyes"

   verb

   • 1. be in a state of sleep; be asleep: "she slept for half an hour"
   • ▪ 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"
   • ▪ be at peace in death; lie buried: literary "he sleeps in Holywell cemetery"
   • 2. provide (a specified number of people) with beds, rooms, or places to stay the night: "studios sleeping two people cost £70 a night"

   Word Origin Old Englishslēp, slǣp (noun), slēpan, slǣpan (verb), of Germanic origin; related to Dutch slapen and German schlafen.

   Scrabble Points: 7

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   More definitions, origin and scrabble points

2. sleep.hms.harvard.edu › education-training › public-educationScience of Sleep: What is Sleep? | Sleep Medicine - Harvard...

   sleep.hms.harvard.edu › education-training › public-education

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   Oct 1, 2021 · Learn how sleep scientists define sleep based on brain waves and physiological functions. Explore the natural patterns of sleep and the factors that disrupt them.

   • Genetics, Aging and Sleep

     For instance, different genes may be responsible for helping...

   • When to Seek Treatment

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   • Apnea

     Apnea - Science of Sleep: What is Sleep? | Sleep Medicine -...

   • Insomnia

     Insomnia - Science of Sleep: What is Sleep? | Sleep Medicine...

3. en.wikipedia.org › wiki › SleepSleep - Wikipedia

   en.wikipedia.org › wiki › Sleep

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   Sleep is a state of reduced mental and physical activity in which consciousness is altered and certain sensory activity is inhibited.

4. Videos

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     2:35

     sleepfoundation.org

     How Sleep Works: Understanding the Science of Sleep

     16 Sep 2015

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     youtube.com

     How does sleep work? - Introduction, Physiology, EEG, Circadian Rhythm & Stages of Sleep

     23 Mar 2023

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     3:32

     youtube.com

     Physiology of Sleep

     6 Jan 2018

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5. www.britannica.com › science › sleepSleep | Definition, Patterns, Deprivation, & Theories |...

   www.britannica.com › science › sleep

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   Sep 1, 2024 · sleep, a normal, reversible, recurrent state of reduced responsiveness to external stimulation that is accompanied by complex and predictable changes in physiology.

6. www.dictionary.com › browse › sleepSLEEP Definition & Meaning | Dictionary.com

   www.dictionary.com › browse › sleep

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   to take the rest afforded by a suspension of voluntary bodily functions and the natural suspension, complete or partial, of consciousness; cease being awake. Synonyms: doze, drowse, nap, slumber. Botany. to assume, especially at night, a state similar to the sleep of animals, marked by closing of petals, leaves, etc.

7. my.clevelandclinic.org › health › bodySleep: What It Is, Why It’s Important, Stages, REM & NREM

   my.clevelandclinic.org › health › body

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   Sleep is a natural process that your body uses to rest and repair itself. While it might seem as simple as closing your eyes and nodding off, sleep is anything but simple. In fact, modern medicine’s understanding of sleep, what it does and how it works is just getting off the ground.

8. www.psychologytoday.com › us › basicsSleep | Psychology Today

   www.psychologytoday.com › us › basics

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   Sleep is the balm that soothes and restores after a long day. Learn about the benefits, needs, and disorders of sleep, as well as how to improve your sleep quality and chronotype.

9. www.ninds.nih.gov › brain-basics-understanding-sleepBrain Basics: Understanding Sleep | National Institute of...

   www.ninds.nih.gov › brain-basics-understanding-sleep

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   Sep 5, 2024 · Without sleep, you can’t form or maintain the pathways in your brain that let you learn and create new memories. Lack of sleep makes it harder to concentrate and respond quickly. Sleep is important to a number of brain functions, including how nerve cells (neurons) communicate with each other.