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Posted by Gwin Willis on March 19, 1998 at 18:22:08:

In Reply to: Re: five stages of sleep posted by Greg Harper on March 15, 1998 at 13:31:58:

It usually goes from light sleep to deeper and deeper sleep; stages 1 to 4 are called NREM sleep. This deep, slow wave sleep [steps 1 to 4] alternates with REM sleep (dreaming) several times over the night. During each sucession, REM sleep becomes longer and NREM sleep becomes shorter.

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