You slept eight hours. You hit the pillow at a reasonable time. But you woke up feeling like you had been hit by a truck, and now you are wondering what the hell is wrong with you. Here is something most doctors will not tell you: the number of hours you sleep matters far less than what is happening during those hours. If you are not cycling through the right stages of sleep, you will wake up wrecked regardless of how long you were in bed.
What Sleep Stages Actually Do
Sleep …
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