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

    APA Dictionary of Psychology

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  3. 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...

    Why do we sleep?
    Despite the universal need for sleep, there remains much about it that scientists don’t understand. It is known that sleep allows for the body and...
    How much sleep do I need?
    Sleep needs vary by age, and variation exists even within age groups. But in general, The National Sleep Foundation provides these daily sleep guid...
    How long should it take me to fall asleep?
    In general, it should take about 10 to 20 minutes for a person to drift off. But if one perceives that it is taking too long—whether it takes 20 mi...
    Do some people need more sleep than others?
    Absolutely. Some people may feel great after 7 hours of sleep, while others don’t feel rested unless they get a solid 9. There do appear to be rare...
    Am I a “short sleeper”?
    “Short sleepers”—or those who are genetically programmed to require less sleep than average—do exist, and are thought to make up approximately 5 pe...
    How can I get better sleep?
    The standard sleep hygiene advice can be of great help to many poor sleepers: Make sure your bedroom is cool and dark. Use your bed only for sex an...
    What is a chronotype?
    The word “chronotype” refers to an individual’s preferred sleep/wake schedule, based on their biologically programmed circadian rhythm . The most w...
    How do I find out my chronotype?
    Most people discover their chronotype by a process of trial and error; they naturally gravitate toward a specific sleep schedule and feel “off” whe...
    Should I replace my mattress?
    An old or poor-quality mattress may be hindering sleep quality. The Better Sleep Council states that mattresses should be replaced every 7 to 10 ye...
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  4. Psychology Dictionary
    https://psychologydictionary.org › sleep

    What is SLEEP? definition of SLEEP (Psychology Dictionary)

  5. Division of Sleep Medicine
    https://sleep.hms.harvard.edu › education-training › ...

    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
  7. Simply Psychology
    https://www.simplypsychology.org › sleep-stages.html

    5 Stages of Sleep: Psychology, Cycle & Sequence

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    3 Stages of Non Rem Sleep
    4 Stages of Sleep Including Rem
  8. 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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    Encyclopedia of Sleep
    Nature of Sleep
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    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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    How is sleep characterized?
    Sleep is characterized by certain patterns of activity of the brain that can be visualized using electroencephalography (EEG), and different phases of sleep can be differentiated using EEG as well (figure below). This is a segment of a polysonograph (PSG), a recording of several physical variables during sleep.

    4.2 Sleep & Why We Sleep – Introductory Psychology - Open Text WSU

    opentext.wsu.edu
    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.

    4.2 Sleep & Why We Sleep – Introductory Psychology - Open Text WSU

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

    4.2. What is Sleep? – Introduction to …

    Sleep is characterized by low levels of physical activity and reduced sensory awareness. Sleep is regulated by circadian rhythms and homeostatic mechanisms (Siegel, 2008). …

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    Introduction
    Sleep Deprivation
  11. BCcampus Open Publishing
    https://opentextbc.ca › psychologymtdi › c…

    Sleep and Why We Need Sleep – …

    You have read that sleep is distinguished by low levels of physical activity and reduced sensory awareness. As discussed by Siegel (2008), a definition of sleep must also include …

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    Sleep Definition
    Introduction
  12. 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
  13. psychologydb.com
    https://dictionary.psychologydb.com › sleep

    sleep definition | Psychology Dictionary

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    Sleep Definition Psychology
    Stages of Sleep
  14. Open Text WSU
    https://opentext.wsu.edu › chapter › sleep-and-why-we-sleep

    4.2 Sleep & Why We Sleep – Introductory Psychology - Open …

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    Sleep Science
    Sleep Definition
    4 Theories of Why We Sleep
  15. 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
  16. National Center for Biotechnology Information
    https://www.ncbi.nlm.nih.gov › books

    Physiology of Sleep - StatPearls - NCBI Bookshelf

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    Stages of Sleep
    Anatomy and Physiology of Sleep
    Function of Sleep
  17. Lumen Learning
    https://courses.lumenlearning.com › wm-abnormalpsych › ...

    Understanding Sleep | Abnormal Psychology - Lumen Learning

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  18. Psychreg
    https://www.psychreg.org › psychology-sleep

    The Psychology of Sleep | Psychreg

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    Sleep Science
    The Psychology of Sleep
    Stage Three Sleep
    Stage Four Sleep
  19. 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
  20. nih.gov
    https://pmc.ncbi.nlm.nih.gov › articles

    Functions and Mechanisms of Sleep - PMC - PubMed Central …

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    Sleep Definition
    Brain
  21. nootropicsplanet.com
    https://nootropicsplanet.com › understanding-sleep-psychology

    Understanding Sleep: A Psychological Perspective

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    Sleep Definition Psychology
    The Psychology of Sleep
  22. 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
  23. American Psychological Association
    https://www.apa.org › topics › sleep › why

    Why sleep is important - American Psychological Association (APA)

    Sleep and Sleep DisordersNov 16, 2020
    Getting a good night’s sleep
    Stress and sleep - American Psychological Association
    Take sleep seriously - American Psychological Association
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    Rem Sleep
  24. Scientific American
    https://www.scientificamerican.com › article › bad...

    Here’s Why Bad Sleep and Toxic Thoughts Go Hand-in-Hand

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    Rem Sleep
    Role
  25. 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
  26. 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
  27. Psychology Today
    https://www.psychologytoday.com › intl › blog › in-practice

    5 Ways to Recover From a Tough Day - Psychology Today

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    Hormones
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