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2. Non-24-hour sleep–wake disorder - Wikipedia

   en.wikipedia.org/wiki/Non-24-hour_sleep–wake...

   Morning light exposure resets the clock earlier, and evening exposure resets it later, thereby bracketing the rhythm to an average 24-hour period. If people who do not have non-24-hour sleep-wake disorder are deprived of external time cues (living in a cave or artificial time-isolated environment with no light), their circadian rhythms will ...

3. Delayed sleep phase disorder - Wikipedia

   en.wikipedia.org/wiki/Delayed_sleep_phase_disorder

   A number of clinicians prescribe it for DSPD patients, as it may improve a sleep-deprived patient's ability to function adequately during socially desirable hours. It is generally not recommended to take modafinil after noon; modafinil is a relatively long-acting drug with a half-life of 15 hours, and taking it during the later part of the day ...

4. Sleep deprivation - Wikipedia

   en.wikipedia.org/wiki/Sleep_deprivation

   Other researchers have questioned these claims. A 2004 editorial in the journal Sleep stated that, according to the available data, the average number of hours of sleep in a 24-hour period has not changed significantly in recent decades among adults. Furthermore, the editorial suggests that there is a range of normal sleep time required by ...

5. Circadian rhythm sleep disorder - Wikipedia

   en.wikipedia.org/wiki/Circadian_rhythm_sleep...

   A circadian rhythm is an entrainable, endogenous, biological activity that has a period of roughly twenty-four hours. This internal time-keeping mechanism is centralized in the suprachiasmatic nucleus (SCN) of humans, and allows for the internal physiological mechanisms underlying sleep and alertness to become synchronized to external environmental cues, like the light-dark cycle. [4]

6. Free-running sleep - Wikipedia

   en.wikipedia.org/wiki/Free-running_sleep

   Free-running sleep is a rare sleep pattern whereby the sleep schedule of a person shifts later every day. [1] It occurs as the sleep disorder non-24-hour sleep–wake disorder or artificially as part of experiments used in the study of circadian and other rhythms in biology.

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

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

   Experts explain what happens to your body when you sleep four hours, health effects of sleep deprivation and tips to improve sleep. ... 24/7 Help. For premium support please call: 800-290-4726 ...

8. Second wind (sleep) - Wikipedia

   en.wikipedia.org/wiki/Second_wind_(sleep)

   A second wind may come more readily at certain points of the circadian (24hr) biological clock than others.. Second wind (or third wind, fourth wind, etc.), a colloquial name for the scientific term wake maintenance zone, is a sleep phenomenon in which a person, after a prolonged period of staying awake, temporarily ceases to feel drowsy, often making it difficult to fall asleep when exhausted.

9. Tired after eating? Here’s why, and how to fix it - AOL

   www.aol.com/science-behind-post-lunch-slump...

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