I never understood this. If I go to bed early and wake up early I feel amazing. But if I go to bed late and wake up late I feel like shit (I don’t have a set routine I’m used to so it’s not that)
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The very simplistic answer is it has to do with your body’s circadian rhythm. This regulates your body and works in a 24 hour cycle.
Your body’s cycle reacts to the environment around you and is heavily impacted by light. When it gets darker, your body knows it is time to relax and settle down.
But even though the actual darkness level at 10pm and 1am might be the same, the amount of hours that have passed since the time it has been light outside is different. Your body at 10pm feels like it is ready for bed. The more time you spend not going to bed after 10pm (or whatever hour), the more your body’s circadian rhythm is being disrupted.
So despite getting the same amount of sleep, your body’s circadian rhythm is still being messed with.
Think of it like music. Listening to loud music while you’re at a concert is totally fine. You might love it. Listening to loud music while trying to solve a math problem is disruptive. Just like you don’t always react to loud music the same way, your body doesn’t always react to 8 hours of sleep the same way.
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