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  2. Sleep - Wikipedia

    en.wikipedia.org/wiki/Sleep

    Children need many hours of sleep per day in order to develop and function properly: up to 18 hours for newborn babies, with a declining rate as a child ages. [65] Early in 2015, after a two-year study, [91] the National Sleep Foundation in the US announced newly revised recommendations as shown in the table below.

  3. Respiratory rate - Wikipedia

    en.wikipedia.org/wiki/Respiratory_rate

    For humans, the typical respiratory rate for a healthy adult at rest is 12–15 breaths per minute. [ 10] The respiratory center sets the quiet respiratory rhythm at around two seconds for an inhalation and three seconds exhalation. This gives the lower of the average rate at 12 breaths per minute. Average resting respiratory rates by age are ...

  4. Non-24-hour sleep–wake disorder - Wikipedia

    en.wikipedia.org/wiki/Non-24-hour_sleep–wake...

    Non-24-hour sleep–wake disorder causes a person's sleep–wake cycle to move around the clock every day, to a degree dependent on the length of the cycle. This is known as free-running sleep. [citation needed] People with the disorder may have an especially hard time adjusting to changes in "regular" sleep–wake cycles, such as vacations ...

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

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

    No, four hours of sleep is not enough for the average person. The minimum amount of sleep recommended for adults by the American Academy of Sleep Medicine is seven hours. These recommendations are ...

  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] Segmented sleep and divided sleep may ...

  7. Insomnia - Wikipedia

    en.wikipedia.org/wiki/Insomnia

    Insomnia, also known as sleeplessness, is a sleep disorder where people have trouble sleeping. [1] [11] They may have difficulty falling asleep, or staying asleep for as long as desired. [1] [9] [12] Insomnia is typically followed by daytime sleepiness, low energy, irritability, and a depressed mood. [1] It may result in an increased risk of ...

  8. Sleep efficiency - Wikipedia

    en.wikipedia.org/wiki/Sleep_efficiency

    Sleep efficiency (SE) is the ratio between the time a person spends asleep, and the total time dedicated to sleep (i.e. both sleeping and attempting to fall asleep or fall back asleep). It is given as a percentage. [1] SE of 80% or more is considered normal/healthy with most young healthy adults displaying SE above 90%.

  9. Sleep deprivation - Wikipedia

    en.wikipedia.org/wiki/Sleep_deprivation

    The U.S. National Sleep Foundation cites a 1996 paper showing that college/university-aged students get an average of less than 6 hours of sleep each night. [45] A 2018 study highlights the need for a good night's sleep for students, finding that college students who averaged eight hours of sleep for the five nights of finals week scored higher ...

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