Wednesday, March 23, 2011

Stages of Sleep

How many hours of sleep do we need?

Sleep requirements vary from one person to another and it change throughout the life cycle. Here’s a list to remind as the normal range of sleep base on age:
  • Up to 18 hours is a significant amount of sleep for newborns.
  • Adolescents require a total of 9.5 hours of sleep.
  • 7 to 8 hours of sleep is needed by adults to restore their energy. But it is reducing as we age.

Through the use of Polysomnography, the main tool to distinguish sleep physiology, the essential five stages of sleep were identified. It is subdivided into REM (Rapid eye movement) sleep and Non-REM sleep. Each stage is a sequence into a deeper sleep. Stages 1 to 4 are under the Non-REM sleep. In aging, Stage 3 and 4, known as deep, restorative sleep, are diminished causing them to have a poor quality of sleep. REM sleep consists of stage 5 in which most dreaming happens. It is said that if you wake up while in REM sleep, you may clearly describe your dreams. Between six and seven hours is the minimum hour our body needs in order to experience these stages.  Sleep fewer than six hours a night will have an effect on our cognitive performance. 

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