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2. Delayed sleep phase disorder - Wikipedia

   en.wikipedia.org/wiki/Delayed_sleep_phase_disorder

   Occasional noncircadian days may occur (i.e., sleep is "skipped" for an entire day and night plus some portion of the following day), followed by a sleep period lasting 12 to 18 hours. The symptoms do not meet the criteria for any other sleep disorder causing inability to initiate sleep or excessive sleepiness.

3. Why do I wake up at 3 a.m. every night? - AOL

   www.aol.com/keep-waking-middle-night-could...

   The most important thing to do when waking up in the middle of the night is to resist looking at the clock, Peters-Mathews said. “If the alarm is not going off, it’s not time to wake up. It ...

4. A Sleep Expert Warns Against "Unhealthy" Sleep Trend - AOL

   www.aol.com/sleep-expert-warns-against-unhealthy...

   “For example, a dog may have a three-to six-hour rhythm, and so that's why they're sleeping part of the time, and then they're up,” says Dr. Pristas. “Human beings have a sleep pattern that ...

5. Waking at the same time each night reveals details ... - AOL

   www.aol.com/article/2016/07/14/waking-at-the...

   If you want to give it a try, they're offering a risk-free 100-night trial guarantee that every night is full of slumber, or you get your money back. Try it today, and get $50 off any mattress ...

6. Cortisol awakening response - Wikipedia

   en.wikipedia.org/wiki/Cortisol_awakening_response

   Waking up earlier in the morning increases the response. [11]Shift work: nurses working on morning shifts with very early awakening (between 4:00–5:30 a.m.) had a greater and prolonged cortisol awakening response than those on the late day shift (between 6:00–9:00 a.m.) or the night shift (between 11:00 a.m.–2:00 p.m.). [12]

7. 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.

8. Middle-of-the-night insomnia - Wikipedia

   en.wikipedia.org/wiki/Middle-of-the-night_insomnia

   Sleep research conducted in the 1990s showed that such waking up during the night may be a natural sleep pattern, rather than a form of insomnia. [2] If interrupted sleep (called "biphasic sleeping" or " bimodal sleep ") is perceived as normal and not referred to as "insomnia", less distress is caused and a return to sleep usually occurs after ...

9. 3 Winter Sleep Problems & How to Fix Them - AOL

   www.aol.com/3-winter-sleep-problems-fix...

   Look for a light therapy box that provides 10,000 lux of light exposure, turn it on within the first hour of waking up, and use it for 20 to 30 minutes. Dry air. Bye, bye moisture. Winter air is ...