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  1. Understanding sleep in the brain involves several key aspects12:
    1. Sleep cycles: Each sleep cycle consists of three non-rapid eye movement stages and one rapid eye movement stage. A person typically goes through four to six cycles per night, allowing the brain to recuperate and support various functions.
    2. Energy conservation and storage: During sleep, cells conserve and store resources used during the day.
    3. Self-repair and recovery: Reduced activity during sleep facilitates healing and repair processes.
    4. Brain maintenance: While asleep, the brain reorganizes and catalogs memories and learned information.
    Learn more:

    Stages of Sleep: What Happens in a Sleep Cycle

    • Three non-rapid eye movement stages and one rapid eye movement stage make up one sleep cycle.
    • A person will typically go through four to six sleep cycles per night, although the duration of each stage may vary.
    www.sleepfoundation.org/stages-of-sleep

    Some of the key things that happen while you’re asleep include:

    • Energy conservation and storage. During the day, cells throughout your body use stockpiled resources to keep doing their jobs. ...
    my.clevelandclinic.org/health/body/12148-sleep-ba…
     
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