Check out this REM graph for referencing how REM sleep works.

This is just a simple graph of the typical sleep cycle.I know this data is readily available, but it’s really nice to have it in a large, clean, graph format. Having this information really helps you know specifically when you should wake up, based on how long it takes to fall asleep. It should be noted however, that this chart is based on subjects that were not under the effects of any sleep altering substances, like alcohol.

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