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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. en.m.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. During sleep, there is a marked decrease in muscle activity and interactions with the surrounding environment.

  3. 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 ...

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

    Jun 8, 2024 · sleep, a normal, reversible, recurrent state of reduced responsiveness to external stimulation that is accompanied by complex and predictable changes in physiology.

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

    Oct 1, 2021 · 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 reduced activity. Sleep is associated with a typical posture, such as lying down with eyes closed in humans. Sleep results in a decreased responsiveness to external stimuli.

  6. 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.

  7. 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.

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

    Oct 23, 2020 · Sleep is a complex and dynamic biological process that still isn’t fully understood. Learn about how sleep works and why it’s vital for overall health.

  9. www.collinsdictionary.com › dictionary › englishSLEEP definition and meaning | Collins English Dictionary

    Sleep is the natural state of rest in which your eyes are closed, your body is inactive, and your mind does not think.

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

    SLEEP definition: 1. to be in the state of rest when your eyes are closed, your body is not active, and your mind is…. Learn more.

  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...