The Sleep Cycle: What's really going on while you're catching your zzz's

Today I continue on my new quest to understand sleep and its role in our lives by attempting to answer a very basic question: what happens when our heads hit the pillow at night?

The 90 minute Sleep Cycle

The sleep cycle: A sleep cycle lasts about 90 minutes and during that time we move through five stages of sleep. The first four stages make up our non-rapid eye movement (NREM) sleep, and the fifth stage is when rapid eye movement (REM) sleep occurs.

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