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  2. What Is Deep Sleep? Understanding the 4 Sleep Cycles & Why ...

    www.aol.com/deep-sleep-understanding-4-sleep...

    Here’s a rough rundown of what happens in each one: NREM, stage 1: light sleep. About five percent of your total sleep time is light sleep. It happens as you fall asleep and drift away from ...

  3. Sleep cycle - Wikipedia

    en.wikipedia.org/wiki/Sleep_cycle

    Sample hypnogram showing one sleep cycle (the first of the night) from NREM through REM. The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and ...

  4. Sleep - Wikipedia

    en.wikipedia.org/wiki/Sleep

    Dreams are a succession of images, ideas, emotions, and sensations that usually occur involuntarily in the mind during certain stages of sleep. During sleep, most of the body's systems are in an anabolic state, helping to restore the immune, nervous, skeletal, and muscular systems; [3] these are vital processes that maintain mood, memory, and ...

  5. Neuroscience of sleep - Wikipedia

    en.wikipedia.org/wiki/Neuroscience_of_sleep

    NREM Stage 1 (N1 – light sleep, somnolence, drowsy sleep – 5–10% of total sleep in adults): This is a stage of sleep that usually occurs between sleep and wakefulness, and sometimes occurs between periods of deeper sleep and periods of REM. The muscles are active, and the eyes roll slowly, opening and closing moderately.

  6. Is 4 hours of sleep enough? What sleeping too little does to ...

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    Since the REM stages typically occur during the second half of sleep, sleeping too little may not allow the body enough time to complete all the REM sleep cycles, per the National Sleep Foundation.

  7. Study shows light during nighttime sleep bad for heart health ...

    www.aol.com/lifestyle/study-shows-light-during...

    To ensure a healthy night’s sleep, the researchers suggest that people turn off all the lights, or have a dim one near the floor; eschew white or blue light, and keep that far from the person ...

  8. Non-rapid eye movement sleep - Wikipedia

    en.wikipedia.org/wiki/Non-rapid_eye_movement_sleep

    Unlike REM sleep, there is usually little or no eye movement during these stages. Dreaming occurs during both sleep states, and muscles are not paralyzed as in REM sleep. People who do not go through the sleeping stages properly get stuck in NREM sleep, and because muscles are not paralyzed a person may be able to sleepwalk.

  9. Sleep and metabolism - Wikipedia

    en.wikipedia.org/wiki/Sleep_and_Metabolism

    Sleep plays a vital role in regulating metabolism and appetite. When sleep deprived, the metabolic system will be out of balance, which will ultimately affect the dietary choices people make. Teens who are sleep deprived crave more carbohydrates. Sleep deprivation is a risk factor for obesity among young adults. [7] [medical citation needed]