Sleep Stages Explained: What Happens in Each Stage of Sleep
Sleep isn’t a single state — it’s four distinct stages cycling through the night. Here is what each one does and why losing any of them costs you something real.
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How Long Is a Sleep Cycle? Stages, Timing, and Why It Matters
A sleep cycle is roughly 90 minutes, but the number alone misses the point. Here is what happens in each cycle and why timing around it changes how rested you feel.