Verywell Health on MSN10h
The 4 Stages of Sleep: What Happens During Each Cycle
Medically reviewed by Sanja Jelic, MD As we sleep, our brain moves through four stages and two phases: non-rapid eye movement ...
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What I Learned Tracking My Sleep Every Night for a Year
Is sleep tracking actually useful in daily life, or is it just data overload distracting you from what matters? After tracking my sleep every night for a year, I have some answers.