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2. Circadian rhythm - Wikipedia

   en.wikipedia.org/wiki/Circadian_rhythm

   A circadian rhythm (/ s ər ˈ k eɪ d i ə n /), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours. Circadian rhythms can refer to any process that originates within an organism (i.e., endogenous ) and responds to the environment (is entrained by the environment).

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 .

4. Sleep - Wikipedia

   en.wikipedia.org/wiki/Sleep

   REM sleep occurs more during body temperature minimum within the circadian cycle, whereas slow-wave sleep can occur more independently of circadian time. [31] The internal circadian clock is profoundly influenced by changes in light, since these are its main clues about what time it is.

5. Going to bed at 9 p.m. every night could improve your health ...

   www.aol.com/finance/going-bed-9-p-m-105200520.html

   The body adjusts to a natural sleep cycle based on the sun and our internal body clock. Due to this, some experts argue that the deepest sleep happens between 10 p.m. and 2 a.m.

6. 7 Factors That Affect Your Natural Sleep-Wake Cycle - AOL

   www.aol.com/7-factors-affect-natural-sleep...

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7. Light effects on circadian rhythm - Wikipedia

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

   Cortisol levels are high upon waking and gradually decrease over the course of the day, melatonin levels are high when the body is entering and exiting a sleeping status and are very low over the course of waking hours. [9] The earth's natural light-dark cycle is the basis for the release of these hormones. [13]

8. What is the Black-white sleep gap, and how is it ... - AOL

   www.aol.com/news/what-is-the-blackwhite-sleep...

   A study from the University of Colorado Boulder in June concluded that college students’ sleep “became more regular and better aligned with their body’s natural sleep-wake cycle” due to ...

9. Polyphasic sleep - Wikipedia

   en.wikipedia.org/wiki/Polyphasic_sleep

   Ekirch's research into the commonality of biphasic sleep in the preindustrial West has led some to conclude he believes that the human body has a "natural preference for segmented sleep." [10] However, when directly asked if he espoused the idea that biphasic sleep was preferable, he responded: "Not at all. At no time in history have conditions ...