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  2. The No. 1 Best Side to Sleep on For Heart Health ... - AOL

    www.aol.com/no-1-best-side-sleep-232500371.html

    If your biggest concern about your heart is the burn you feel at 3 a.m., flip over to the left side and drift back to sleep. "Sleeping on the left side often helps with acid reflux," Dr. Vuppuluri ...

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

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

    Long-term sleep deprivation is linked to an elevated risk of heart attack, stroke, hypertension, heart disease, diabetes, kidney disease and metabolic syndrome, the experts note.

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

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

    A few sleep hacks. Go easy on alcohol and cannabis: Even a little bit of drinking can scramble your sleep—helping you drift off more easily, perhaps, but causing you to awaken more during the night.

  5. 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.

  6. Polyphasic sleep - Wikipedia

    en.wikipedia.org/wiki/Polyphasic_sleep

    They would sleep for about four hours, wake up for two to three hours, then go back to bed for another four hours. They also took about two hours to fall asleep. [11] Polyphasic sleep can be caused by irregular sleep-wake syndrome, a rare circadian rhythm sleep disorder which is usually caused by neurological abnormality, head injury or ...

  7. Isovolumic relaxation time - Wikipedia

    en.wikipedia.org/wiki/Isovolumic_relaxation_time

    Wiggers diagram of the cardiac cycle, with isovolumic relaxation marked at top. Isovolumic relaxation time (IVRT) is an interval in the cardiac cycle, from the aortic component of the second heart sound, that is, closure of the aortic valve, to onset of filling by opening of the mitral valve. [1]

  8. 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. ... “Trouble falling back to sleep is most frequently ...

  9. Light effects on circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Light_effects_on_circadian...

    [6] [4] Light seems to have therapeutic antidepressant effects when an organism is exposed to it at appropriate times during the circadian rhythm, regulating the sleep-wake cycle. [ 6 ] [ 4 ] In addition to mood, learning and memory become impaired when the circadian system shifts due to light stimuli, [ 6 ] [ 20 ] which can be seen in studies ...