Can you learn while you sleep? from the Harvard Men's Health Watch
Sleep is divided into two major phases, rapid-eye-movement (REM) and non–rapid-eye-movement (NREM). Sleep begins with the NREM state, which lasts about 60 to 90 minutes, before REM sleep kicks in. Dreaming is most common during REM sleep, but it may also occur during the early stages of NREM sleep.
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