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  1. Circadian state
    n. a circadian state characterized by partial or total suspension of consciousness, voluntary muscle inhibition, and relative insensitivity to stimulation. Other characteristics include unique sleep-related electroencephalogram and brain-imaging patterns (see sleep stages).

    APA Dictionary of Psychology

    dictionary.apa.org/sleep
    dictionary.apa.org/sleep
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  2. APA Dictionary of Psychology
    https://dictionary.apa.org › sleep

    APA Dictionary of Psychology

    • Why Sleep is Important

      According to sleep researchers, a night's sleep is divided into five continually shifting stages, defined by types of brain waves that reflect eit…

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  3. Psychology Dictionary
    https://psychologydictionary.org › sleep

    What is SLEEP? definition of SLEEP (Psychology Dictionary)

  4. Psychology Today
    https://www.psychologytoday.com › us › b…

    Sleep | 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...

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    Sleep
  6. Britannica
    https://www.britannica.com › science › sleep

    Sleep | Definition, Patterns, Deprivation, & Theories

    Jan 2, 2025 · Sleep, a normal, reversible, recurrent state of reduced responsiveness to external stimulation that is accompanied by complex and predictable changes in physiology. Sleep contrasts with wakefulness, in which …

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    Sleep Science
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    Sleep - Wikipedia
    Encyclopedia of Sleep
  7. American Psychological Association
    https://www.apa.org › topics › sleep › why

    Why sleep is important - American Psychological Association (APA)

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    Sleep Science
    Stages of Sleep
    Sleep Disorders
  8. Division of Sleep Medicine
    https://sleep.hms.harvard.edu › education …

    Science of Sleep: What is Sleep? | Sleep Medicine

    Oct 1, 2021 · From observations of behavioral changes that accompany sleep and simultaneous physiological changes, scientists now define sleep in humans based on brain wave activity patterns and other physiological changes as …

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    Popular Science Sleep
    Scientific Term For Sleep
    Time The Science of Sleep
  9. People also ask
    What does sleep mean in psychology?
    Sam holds a masters in Child Psychology and is an avid supporter of Psychology academics. Psychology Definition of SLEEP: a state featuring relaxation, reduced metabolism and relative insensitivity to stimulation. We have unique brain wave patterns

    What is SLEEP? definition of SLEEP (Psychology Dictionary)

    psychologydictionary.org
    Is sleepiness a symptom?

    Dr. Himabindu Sreenivasulu

    MBBS · 1 years of exp

    Yes, sleepiness can be a symptom of various underlying factors. It could be due to insufficient sleep, sleep disorders like sleep apnea or narcolepsy, medical conditions like anemia or thyroid issues, medication side effects, or mental health conditions like depression. If sleepiness is persistent, severe, or impacting daily life, it's important to consult a healthcare provider. They can help identify the underlying cause and recommend appropriate treatment or lifestyle adjustments to address the issue and improve overall sleep quality and wakefulness.
    Q&A: Sleep
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    What is sleep physiology?
    Sleep is a state that is characterized by changes in brain wave activity, breathing, heart rate, body temperature, and other physiological functions. Depending on the sleep stage, different physiological functions may be more active and variable (for example, during REM sleep), or less active and more stable (for example, during NREM.

    Science of Sleep: What is Sleep? | Sleep Medicine - Harvard University

    sleep.hms.harvard.edu
    What is the purpose of sleep?
    A succinctly defined specific purpose of sleep remains unclear, but that is partly because sleep is a dynamic state that influences all physiology, rather than an individual organ or other isolated physical system.

    Sleep | Definition, Patterns, Deprivation, & Theories | Britannica

    britannica.com
    What is the theory of sleep?
    One popular hypothesis of sleep incorporates the perspective of evolutionary psychology. Evolutionary psychology is a discipline that studies how universal patterns of behavior and cognitive processes have evolved over time as a result of natural selection.

    Sleep and Why We Sleep – General Psychology - University of Central

    pressbooks.online.ucf.edu
    Do you know what sleep is?
    We all have at least a vague notion of what sleep is, but that doesn't mean that defining this mysterious part of our lives is simple. After all, detailed analysis of our own sleep isn't really an option, given that we rarely know that we're sleeping when we're asleep.

    Science of Sleep: What is Sleep? | Sleep Medicine - Harvard University

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  10. Psychreg
    https://www.psychreg.org › psychology-sle…

    The Psychology of Sleep | Psychreg

    Jan 24, 2022 · Sleep is one of those subjects that when you start asking questions, any answers just lead to more questions. Sleep, to borrow an observation from Winston Churchill: ‘Is a riddle, wrapped in a mystery, inside …

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    Sleep Science
    The Psychology of Sleep
    Stage Three Sleep
    Stage Four Sleep
  11. nootropicsplanet.com
    https://nootropicsplanet.com › understanding-sleep-psychology

    Understanding Sleep: A Psychological Perspective

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    Sleep Definition Psychology
    The Psychology of Sleep
  12. Simply Psychology
    https://www.simplypsychology.org › sleep …

    5 Stages of Sleep: Psychology, Cycle & Sequence

    Aug 3, 2023 · Put simply, sleep is a state of perceptual disengagement from and unresponsiveness to the environment, marked by unique physiological and behavioral processes (Carskadon & Rechtschaffen, 2011). During …

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    Sleep Science
    3 Stages of Non Rem Sleep
    4 Stages of Sleep Including Rem
  13. AlleyDog.com
    https://www.alleydog.com › glossary › definition.php

    Sleep definition | Psychology Glossary - AlleyDog.com

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    Sleep Definition Psychology
    Importanmce of Sleep
  14. psychologydb.com
    https://dictionary.psychologydb.com › sleep

    sleep definition | Psychology Dictionary

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    Sleep Definition Psychology
    Stages of Sleep
  15. Fiveable
    https://library.fiveable.me › key-terms › ap-psych › sleep

    Sleep - (AP Psychology) - Vocab, Definition, Explanations - Fiveable

  16. CUNY Pressbooks Network
    https://pressbooks.cuny.edu › chapter

    4.2. What is Sleep? – Introduction to Psychology (A critical …

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    Introduction
    Sleep Deprivation
  17. National Center for Biotechnology Information
    https://www.ncbi.nlm.nih.gov › books

    Physiology of Sleep - StatPearls - NCBI Bookshelf

    Apr 3, 2023 · Sleep is an extremely complicated process that consists of more than simply closing one’s eyelids and counting sheep. It is an active state of unconsciousness produced by the body where the brain is in a relative state of …

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    Stages of Sleep
    Anatomy and Physiology of Sleep
    Function of Sleep
  18. BCcampus Open Publishing
    https://opentextbc.ca › psychologymtdi › chapter › sleep...

    Sleep and Why We Need Sleep – Introduction to Psychology

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    Sleep Definition
    Introduction
  19. Wikipedia
    https://en.wikipedia.org › wiki › Sleep

    Sleep - Wikipedia

  20. nih.gov
    https://pmc.ncbi.nlm.nih.gov › articles

    Functions and Mechanisms of Sleep - PMC - PubMed Central …

  21. University of Central Florida Pressbooks
    https://pressbooks.online.ucf.edu › lumenpsychology › ...

    Sleep and Why We Sleep – General Psychology - University of …

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    Sleep Definition
    Psychology
  22. Lumen Learning
    https://courses.lumenlearning.com › waymaker...

    Sleep and Why We Sleep | Introduction to Psychology - Lumen …

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    Sleep Science
    Sleep Definition Psychology
    4 Theories of Why We Sleep
  23. Psychreg
    https://www.psychreg.org › sleep-cornerstone-psychological-health

    Sleep: A Cornerstone of Psychological Health | Psychreg

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    The Psychology of Sleep
    Well-being
  24. Dalhousie Libraries Digital Editions
    https://digitaleditions.library.dal.ca › intropsychn...

    Sleep and Why We Sleep – Introduction to Psychology

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    Sleep Definition
    Introduction
  25. novapsychology.ca
    https://novapsychology.ca › the-psychology-of-sleep

    The Psychology Of Sleep: Unraveling The Mysteries Of Our …

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    The Psychology of Sleep
    Nova
  26. Psychology Today
    https://www.psychologytoday.com › us › blog › in-practice

    5 Ways to Recover From a Tough Day | Psychology Today

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    Sleep
    Hormones
  27. Mayo Clinic Press
    https://mcpress.mayoclinic.org › living-well › the...

    The essential guide to sleep: Unlocking its vital role in our well ...

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    The Psychology of Sleep
    Well-being
    Sleep Disorders
    The Science of Sleep
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