Psychology / Unit 3 Psych 0324 worked example, 60 to 90 seconds
The Sleep Cycle
Captions available
The idea
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.
In practice
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.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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