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  2. Sleep - Wikipedia

    en.wikipedia.org/wiki/Sleep

    Sleep. Sleeping Girl, Domenico Fetti, c. 1615. Sleep is a state of reduced mental and physical activity in which consciousness is altered and certain sensory activity is inhibited. During sleep, there is a marked decrease in muscle activity and interactions with the surrounding environment.

  3. Polyphasic sleep - Wikipedia

    en.wikipedia.org/wiki/Polyphasic_sleep

    Polyphasic sleep is the practice of sleeping during multiple periods over the course of 24 hours, in contrast to monophasic sleep, which is one period of sleep within 24 hours. Biphasic (or diphasic, bifurcated, or bimodal) sleep refers to two periods, while polyphasic usually means more than two. [1] Segmented sleep and divided sleep may refer ...

  4. Randy Gardner sleep deprivation experiment - Wikipedia

    en.wikipedia.org/wiki/Randy_Gardner_sleep...

    Gardner's sleep recovery was observed by sleep researchers who noted changes in sleep structure during post-deprivation recovery. [10] [11] After completing his record, Gardner slept for 14 hours and 46 minutes, awoke naturally around 8:40 p.m., and stayed awake until about 7:30 p.m. the next day, when he slept an additional ten and a half hours.

  5. 10 Tips to Increase REM Sleep Naturally - AOL

    www.aol.com/10-tips-increase-rem-sleep-115700126...

    Most adults who sleep the recommended seven to nine hours a night get roughly one to two hours of REM sleep. So, REM sleep should account for about 25 percent of your total sleep time.

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

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

    While you can catch up from a night or two of poor sleep by resuming your routine for the next few nights, Atwood says, chronic sleep deprivation, lasting for months or years, can lead to "lasting ...

  7. Sleep deprivation - Wikipedia

    en.wikipedia.org/wiki/Sleep_deprivation

    Cognitive behavioral therapy, caffeine (to induce alertness), sleeping pills. Sleep deprivation, also known as sleep insufficiency[ 2 ] or sleeplessness, is the condition of not having adequate duration and/or quality of sleep to support decent alertness, performance, and health. It can be either chronic or acute and may vary widely in severity ...

  8. Familial natural short sleep - Wikipedia

    en.wikipedia.org/wiki/Familial_natural_short_sleep

    Genetic mutation. Prevention. none. Familial natural short sleep is a rare, genetic, typically inherited trait where an individual sleeps for fewer hours than average without suffering from daytime sleepiness or other consequences of sleep deprivation. This process is entirely natural in this kind of individual, and it is caused by certain ...

  9. Nap - Wikipedia

    en.wikipedia.org/wiki/Nap

    A nap is a form of biphasic or polyphasic sleep, where the latter terms also include longer periods of sleep in addition to one period. For years, scientists have been investigating the benefits of napping, including the 30-minute nap as well as sleep durations of 1–2 hours. Performance across a wide range of cognitive processes has been tested.