Psychology / Psych 0324 · Procedure · 60–90 seconds
The Sleep Cycle
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State
The sleep cycle runs N1 to N2 to N3 and back up into REM, repeating roughly every ninety minutes with shifting proportions across the night.
Show
A full night traced hour by hour: the first cycle heavy with N3, the third and fourth carrying long REM periods, and the reason a person woken at six feels different from one woken at two. Every stage transition named as it occurs.