How tired you are when you wake up depends a lot on which phase of sleep you wake up from. The average sleep cycle lasts between 90 and 110 minutes, so basically it's a bit variable. Maybe your body is adapted to fitting several sleep cycles into 8 hours such that you wake up out of a phase of sleep that doesn't make you feel groggy. At the same time, you don't always wake up after each sleep cycle (although I think I've heard of people learning to do just that). I do know that if you set your alarm and wake up at the same time every day (yes, even on weekends ), your body will eventually get used to it and you'll even wake up a bit before it goes off. If you get to that point, you'll probably be pretty alert during the day |
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