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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"
    • 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"
    • 2. provide (a specified number of people) with beds, rooms, or places to stay the night: "studios sleeping two people cost £70 a night"

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  2. www.merriam-webster.com › dictionary › sleepSleep 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 surroundings, is accompanied by a typical body posture (such as lying down with the eyes closed), the occurrence of dreaming, and changes in brain activity and ...

  3. dictionary.cambridge.org › dictionary › englishSLEEP | English meaning - Cambridge Dictionary

    SLEEP definition: 1. the resting state in which the body is not active and the mind is unconscious: 2. to start…. Learn more.

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

    Sleep definition: to take the rest afforded by a suspension of voluntary bodily functions and the natural suspension, complete or partial, of consciousness; cease being awake.. See examples of SLEEP used in a sentence.

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

    Jul 20, 1998 · sleep, a normal, reversible, recurrent state of reduced responsiveness to external stimulation that is accompanied by complex and predictable changes in physiology.

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

    Sleep is a state of reduced mental and physical activity in which consciousness is altered and certain sensory activity is inhibited. Learn about the physiology, brain waves, stages, cycles, and purposes of sleep, as well as the common sleep disorders and their causes.

  7. dictionary.cambridge.org › dictionary › learner-englishSLEEP | meaning - Cambridge Learner's Dictionary

    Learn the meaning of sleep as a verb and a noun, with examples of usage and idioms. Find out how to say sleep in different languages and how to use the translator tool.

  8. www.sleepfoundation.org › how-sleep-worksHow Sleep Works: Understanding the Science of Sleep

    Oct 23, 2020 · Learn about the key details of what happens to the mind and body during sleep, including the sleep stages, the sleep-wake homeostasis, the circadian alerting system, and the chemicals and hormones that regulate sleep. Explore how sleep affects your physical, emotional, and mental health and how you can improve your sleep quality.

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

    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.

  10. www.vocabulary.com › dictionary › sleepSleep - Definition, Meaning & Synonyms | Vocabulary.com

    Learn the various meanings and uses of the word sleep, from a natural state of rest to a euphemism for death. Find synonyms, pronunciation, examples and word family of sleep.

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

    Sleep is the balm that soothes and restores after a long day. Sleep is largely driven by the body’s internal clock, which takes cues from external elements such as sunlight and...