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  2. Circadian clock - Wikipedia

    en.wikipedia.org/wiki/Circadian_clock

    In vertebrates, the master circadian clock is contained within the suprachiasmatic nucleus (SCN), a bilateral nerve cluster of about 20,000 neurons. [10] [11] The SCN itself is located in the hypothalamus, a small region of the brain situated directly above the optic chiasm, where it receives input from specialized photosensitive ganglion cells in the retina via the retinohypothalamic tract.

  3. Circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Circadian_rhythm

    A circadian rhythm (/ s ər ˈ k eɪ d i ə n /), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours.Circadian rhythms can refer to any process that originates within an organism (i.e., endogenous) and responds to the environment (is entrained by the environment).

  4. Do You Really Need 8 Hours Of Sleep? Why Experts Are ... - AOL

    www.aol.com/lifestyle/really-8-hours-sleep-why...

    You Don’t Need 8 Hours Of Sleep. Actually, maybe you do. But maybe you don’t. ... To maintain intimacy, plan to spend time together prior to parting ways every night, watching TV, reading ...

  5. 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 ]

  6. Do you really need 8 hours of sleep every night? Sleep ... - AOL

    www.aol.com/news/really-8-hours-sleep-every...

    “Sleep is important for pretty much every system in your body,” says Atwood. In the short-term, sleeping well below the amount you need can cause deficits in cognitive functioning.

  7. every 6 hours quaque sexta hora q.8.h., q8h every 8 hours quaque octava hora q.a.m., qAM, qam every morning: quaque ante meridiem q.d., qd every day / daily quaque die q.h.s., qhs every night at bedtime quaque hora somni q.d.s, qds, QDS 4 times a day quater die sumendum q.i.d, qid 4 times a day quater in die q.h., qh every hour, hourly quaque ...