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  2. 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.

  3. Sleep - Wikipedia

    en.wikipedia.org/wiki/Sleep

    While the body benefits from sleep, the brain actually requires sleep for restoration, whereas these processes can take place during quiescent waking in the rest of the body. [97] The essential function of sleep may be its restorative effect on the brain: "Sleep is of the brain, by the brain and for the brain."

  4. Light effects on circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Light_effects_on_circadian...

    A delay, caused by light exposure before sleeping, means that the individual will tend to wake up later on the following day(s). The hormones cortisol and melatonin are affected by the signals light sends through the body's nervous system. These hormones help regulate blood sugar to give the body the appropriate amount of energy that is ...

  5. 9 Tips to Increase Deep Sleep (& How That Could Help ... - AOL

    www.aol.com/9-tips-increase-deep-sleep-125800276...

    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 ...

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

    www.aol.com/news/4-hours-sleep-enough-sleeping...

    At night, the body cycles through five stages which fall into two categories: rapid eye movement or REM sleep and non-REM sleep, TODAY.com previously reported. During the recommended seven hours ...

  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. Sleep cycle - Wikipedia

    en.wikipedia.org/wiki/Sleep_cycle

    N2 is when the person experiences a light sleep. Eye movement has stopped by this time. Brain wave frequency and muscle tonus is decreased. The heart rate and body temperature also goes down. N3 or even N4 are the most difficult stages to be awakened. Every part of the body is now relaxed, breathing, blood pressure and body temperature are reduced.

  9. You Can Control The Outcome Of Your Dreams. Sleep Scientists ...

    www.aol.com/lifestyle/control-outcome-dreams...

    Though you can have dreams during NREM sleep, it’s likelier for more interesting and in-depth dreams to occur during REM sleep. There are a few key things that happen to your body during this phase.