Basics of the Cycle
Sleep falls into two categories: rapid eye movement (REM) and non-REM sleep. Non-REM sleep consists of three stages, named N1, N2, and N3. People generally cycle through these first three stages in about 70 to 90 minutes, followed by REM. The whole cycle takes around 90 to 110 minutes and then starts over again. The duration of each part of the cycle changes as the night goes on.
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