Eli5
In: Biology
The actual clock times are arbitrary and don’t really matter. Your body has a circadian rhythm. Thats basically its standard cycle of operations. If you deviate from that cycle its doesn’t operate as well. If you maintain the change your body will eventually adjust its rhythm. But if you only occasionally stay up late and sleep late your rhythm will stay the same and the single night change will throw you off every time.
There are also some environmental factors. Unless you have really blocked all the windows in your room, it gets significantly brighter once the sun is up. People are also more active around you and the ambient noise level can rise. Car horns, loud cars, lawn mowers, etc.
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