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  2. Sleep inertia - Wikipedia

    en.wikipedia.org/wiki/Sleep_inertia

    Prior sleep deprivation increases the percentage of time spent in slow-wave sleep (SWS). Therefore, an individual who was previously sleep deprived will have a greater chance of experiencing sleep inertia. [4] [7] Adenosine levels in the brain progressively increase with sleep deprivation, and return to normal during sleep. Upon awakening with ...

  3. How to Know If 6 Hours of Sleep Is Enough - AOL

    www.aol.com/know-6-hours-sleep-enough-235900599.html

    Can you really get by with just 6 hours of sleep a night? Here's what to know and how to get more sleep.

  4. Is 6 hours of sleep at night enough? - AOL

    www.aol.com/news/6-hours-sleep-night-enough...

    Even one night without enough sleep can impact the body and brain the following day. ... Long-term sleep deprivation is linked to an elevated risk of heart attack, stroke, hypertension, heart ...

  5. Not Everyone Needs the Same Amount of Sleep. Here's Why - AOL

    www.aol.com/not-everyone-needs-same-amount...

    About one in 10 suffer from the chronic form of the condition. known as insomnia disorder, which is defined as three or more nights of sleep problems per week lasting three or more months ...

  6. 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 ]

  7. Is Waking Up in the Middle of the Night Normal? Here's What ...

    www.aol.com/waking-middle-night-normal-heres...

    In addition to normal ways of moving into a new sleep stage, there are a whole slew of reasons why someone could wake up during the night. ... If you do wake up and can’t fall back to sleep no ...

  8. Sleeping positions - Wikipedia

    en.wikipedia.org/wiki/Sleeping_positions

    A Canadian survey found that 39% of respondents preferring the "log" position (lying on one's side with the arms down the side) and 28% preferring to sleep on their side with their legs bent. [ 1 ] A Travelodge survey found that 50% of heterosexual British couples prefer sleeping back-to-back, either not touching (27%) or touching (23%).

  9. The Truth About Whether 7 Hours of Sleep Is Enough ... - AOL

    www.aol.com/truth-whether-7-hours-sleep...

    One National Institutes of Health-funded study published in the Journal of Experimental Medicine noted that good sleep can boost immune function. 4. Developing a chronic condition