Why Do I Wake Up at 3 AM? 7 Common Causes and What Helps
Waking briefly between sleep cycles is normal. Waking at 3 AM and lying awake usually has a cause, from alcohol and stress to a too-warm bedroom. Here is what helps.
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How Long Is a Sleep Cycle? The 4 Stages of Sleep, Explained
A sleep cycle lasts about 90 minutes in adults, but anywhere from 70 to 110. Here is what happens in each stage, and why the timing matters when you wake up.
