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

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    Deep sleep refers to slow-wave sleep — a stage in the sleep cycle when brain waves slow down. ... Most adults who sleep the recommended seven to nine hours a night get about one to two hours of ...

  3. Sleep cycle - Wikipedia

    en.wikipedia.org/wiki/Sleep_cycle

    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 wakefulness. In humans, this cycle takes 70 to 110 minutes (90 ± 20 minutes). [1]

  4. Chronotype - Wikipedia

    en.wikipedia.org/wiki/Chronotype

    Baehr et al. [27] found that, in young adults, the daily body temperature minimum occurred at about 4 a.m. for morning types but at about 6 a.m. for evening types. This minimum occurred at approximately the middle of the eight-hour sleep period for morning types, but closer to waking in evening types. Evening types had a lower nocturnal ...

  5. Sleep - Wikipedia

    en.wikipedia.org/wiki/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 environm

  6. 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]

  7. Irregular Sleep-Wake Cycles May Raise Heart Attack, Stroke ...

    www.aol.com/lifestyle/irregular-sleep-wake...

    The authors found that the risk of heart attack, stroke, and heart failure all increased significantly in people with irregular sleep patterns, even if they got the recommended number of hours of ...

  8. Hypnogram - Wikipedia

    en.wikipedia.org/wiki/Hypnogram

    Cycles of REM and non-REM stages make up sleep. A normal healthy adult requires 7–9 hours of sleep per night. The number of hours of sleep is variable, however the proportion of sleep spent in a particular stage remains mostly consistent; healthy adults normally spend 20–25% of their sleep in REM sleep. [5]

  9. Do Millennials Sleep Better than Boomers? - AOL

    www.aol.com/millennials-sleep-better-boomers...

    Social media usage most significantly impacts Gen Z’s sleep, with 35% of people in this age group stating that engaging with social media is the number one disruptor of their sleep.

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