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10 PM vs 4 AM Sleep: Which 8 Hours of Sleep Is Better? | Sleep Science Explained
They're both 8 hours-but biologically, they're very different. Sleep from 10 p.m. to 6 a.m. is aligned with your circadian rhythm: melatonin peaks at night, deep (slow-wave) sleep is highest in the early night, and hormonal repair (growth hormone, immune activity) happens optimally in darkness. Sleep from 4 a.m. to 12 p.m. misses that window ...
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