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2. 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] Segmented sleep and divided sleep may refer ...

3. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Noise-cancelling headphones are headphones that suppress unwanted ambient sounds using active noise control (ANC). Active noise cancellation makes it possible to listen to audio content without raising the volume excessively. In an aviation environment, noise-cancelling headphones increase the signal-to-noise ratio significantly more than ...

4. Best and worst bedtimes for various generations - AOL

   www.aol.com/news/best-worst-bedtimes-various...

   For school-age children, a bedtime between 7:15 p.m. and 9 p.m. is generally a good idea, per Parents.com. Teenagers don't need as much sleep as children do. For teenagers between the ages of 14 ...

5. Excessive daytime sleepiness - Wikipedia

   en.wikipedia.org/wiki/Excessive_daytime_sleepiness

   Excessive daytime sleepiness (EDS) is characterized by persistent sleepiness and often a general lack of energy, even during the day after apparently adequate or even prolonged nighttime sleep. EDS can be considered as a broad condition encompassing several sleep disorders where increased sleep is a symptom, or as a symptom of another ...

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

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

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

   Long-term health effects of sleeping four hours. While you can catch up from a night or two of poor sleep by resuming your routine for the next few nights, Atwood says, chronic sleep deprivation ...