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All stages of sleep are critical. Different types of sleep perform different functions for the brain and the body at different times of night. But we need all of those stages of sleep—there is no one stage of sleep that's more
important.
Matthew Walker
Woke Up 2 Hours Early? You Missed Out on 60-70% of Your REM Sleep
#01 What is Sleep? (aka What's going to happen when you fall asleep tonight?)
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