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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. Do you wake up at 4am? Scientists know what might be ... - AOL

   www.aol.com/news/do-you-wake-up-at-4-am...

   Researchers studied 300 people with ‘advanced sleep phase’.

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. Sleep inertia - Wikipedia

   en.wikipedia.org/wiki/Sleep_inertia

   Sleep inertia is a physiological state of impaired cognitive and sensory-motor performance that is present immediately after awakening. It persists during the transition of sleep to wakefulness, where an individual will experience feelings of drowsiness, disorientation and a decline in motor dexterity.

7. 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 ...

8. 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]

9. 5 sleep tips to get better rest during the busy holiday season

   www.aol.com/5-sleep-tips-better-rest-093035134.html

   Getting a good night's sleep can be a little more challenging amid the hype of the holidays. With changes in routine, diet and potentially time zones, quality sleep could be difficult to come by ...