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Understanding the Stages of Sleep

Stages of Sleep
  • Scientists used to think brain activity dropped to nearly zero during sleep but after new technology that idea has changed
  • There are five stages of sleep. The first two stages are light. The third and fourth are often where sleep disorders occur. Then the fifth stage is when REM sleep occurs; this is the deepest sleep and is when blood pressure and heart rate increase
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Sleeping Disorders18 Oct 2008Comments (0)