The Howstuffworks page about sleep is really interesting, and answers questions like why we all need to sleep, or what causes dreams. The article goes on to explain, with the help of a diagram, the 5 stages of the sleep cycle. Also, lucid explanation of other concepts, such as REM sleep, and what happens when we don't get enough sleep.
For all of us who would like to know the scientific explanation of sleep, explained in a language that we can understand, this is a valuable source.
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