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  2. Nap - Wikipedia

    en.wikipedia.org/wiki/Nap

    A nap is a short period of sleep, typically taken during daytime hours as an adjunct to the usual nocturnal sleep period. Naps are most often taken as a response to drowsiness during waking hours. A nap is a form of biphasic or polyphasic sleep , where the latter terms also include longer periods of sleep in addition to one period.

  3. Insomnia affects up to 50% of adults and can hurt your body ...

    www.aol.com/finance/insomnia-affects-50-adults...

    Sleep hygiene also plays a crucial role in how well you rest at night. And one of the main mistakes people make, experts say, is staying in bed while you are awake, restless, and anxious.

  4. Sleeping less also puts people at risk of mental health problems like anxiety and depression. One study found older adults who get five or fewer hours of sleep are at risk for developing multiple ...

  5. Excessive daytime sleepiness - Wikipedia

    en.wikipedia.org/wiki/Excessive_daytime_sleepiness

    EDS can affect the ability to function in family, social, occupational, or other settings. [1] [2] A proper diagnosis of the underlying cause and ultimately treatment of symptoms and/or the underlying cause can help mitigate such complications. [3] According to the National Sleep Foundation, around 20 percent of people experience EDS. [4]

  6. Sleep deprivation - Wikipedia

    en.wikipedia.org/wiki/Sleep_deprivation

    Chronotype can affect how sleep deprivation influences mood. Those with morningness (advanced sleep period or "lark") preference become more depressed after sleep deprivation, while those with eveningness (delayed sleep period or "owl") preference show an improvement in mood. [62] Mood and mental states can affect sleep as well.

  7. Sleep onset latency - Wikipedia

    en.wikipedia.org/wiki/Sleep_onset_latency

    The number of minutes passed is the sleep onset latency at that particular hour on that particular day. [1]: 340 Dement advises against doing these evaluations at night when sleep onset latency can naturally be lower, particularly in older people.

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

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

    Most people do not get enough sleep each night because of life circumstances such as work or school, their lifestyle, poor sleep hygiene or sleeping disorders, Shelby Harris, Psy.D., a clinical ...

  9. 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 ]