eli5: How does waking up late in the day despite getting 8 hours of sleep make my head get a headache

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For context I was playing games all the way until around 3:00 AM and it took me around an hour to fall asleep and I woke up at 12 PM. So I had 8 hours of sleep but still feel like crap when waking up. Is it because I’m waking up midday and if so why does waking up at midday cause the headache

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Anonymous 0 Comments

First of all, you might have needed a little more after staying up that long, or have a headache from another (possibly related, like water intake, or screen-time-related) source.

Secondly, people have something called a circadian rhythm, which is basically an internal clock that tells you when to be tired and when not. The circadian rhythm can be shifted and for most people isn’t exactly 24h anyway, but shifting it takes some more time than just one night. Another way too see it do its thing is jetlag, some people take more than a week to get accustomed to a new time zone.