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• 29 Dec 09
  

  nYodha

  sleep

• 22 Sep 09
  

  Leann Young
  • It is observed in all mammals, including humans, all birds, and many reptiles, amphibians, and fish. In humans, other mammals, and a substantial majority of other animals that have been studied (such as some species of fish, birds, ants, and fruit flies), regular sleep is essential for survival.
• 05 Sep 09
  

  Fredrik Heintz
  • In mammals and birds, sleep is divided into two broad types: Rapid Eye Movement (REM) and Non-Rapid Eye Movement (NREM or non-REM) sleep. Each type has a distinct set of associated physiological, neurological, and psychological features. The American Academy of Sleep Medicine (AASM) further divides NREM into three stages: N1, N2, and N3, the last of which is also called delta, or slow-wave, sleep (SWS).
• 20 May 09
  

  Kepler L

  sleep science wiki psychology biology human

  • regular sleep is essential for survival.
  • Drugs such as sleeping pills and alcoholic beverages can suppress certain stages of sleep, leading to sleep deprivation^{[citation needed]}.
• 06 May 08
  

  Matthew James

  Sleep is a natural state of bodily rest observed throughout the animal kingdom. It is common to all mammals and birds, and is also seen in many reptiles, amphibians and fish.

  sleep

  • stages 1 > 2 > 3 > 4 > 3 > 2 > REM.
  • Non-REM encompasses four stages; stages 1 and 2 are considered 'light sleep', and 3 and 4 'deep sleep' or slow-wave sleep, SWS.
  • 11 more annotations...
  • • In non-REM sleep there are often limb movements, and parasomnias such as sleepwalking may occur.
    • transitions from alpha waves (common to people who are awake and having a frequency of 8 to 13 Hz) to theta waves (frequency of 4 to 7 Hz).
    • sudden twitches and hypnic jerks.
    • muscular activity as measured by electromyography (EMG) lowers and conscious awareness of the external environment disappears.
    • This is the stage in which night terrors, bed wetting, sleepwalking and sleep-talking occur.
    • Both REM sleep and NREM sleep stages 3 and 4 are homeostatically driven; that is, if a person or animal is selectively deprived of one of these, it rebounds once uninhibited sleep again is allowed. This suggests that both are essential to the functions of the sleep process.
    • A normal person who regularly awakens at an early hour will generally not be able to sleep much later than the person's normal waking time, even if moderately sleep deprived.
    • The National Sleep Foundation in the United States maintains that eight to nine hours of sleep for adult humans is optimal and that sufficient sleep benefits alertness, memory and problem solving, and overall health, as well as reducing the risk of accidents
    • Researchers from the University of Warwick and University College London have found that lack of sleep can more than double the risk of death from cardiovascular disease, but that too much sleep can also double the risk of death.^[13][14]
    • In terms of prevention, our findings indicate that consistently sleeping around 7 hours per night is optimal for health and a sustained reduction may predispose to ill-health
    • Adults, including elderly
      7-8 (+) hours
• 27 Aug 07
  

  balazs3

  alvás hasznos-Érdekes matrac

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