eli5: Why sleeping late and waking up late is worse than sleeping early and wake up early

Question

Lets say I sleep at 1am and wake up at 9am, why my body reacts negatively compared to sleep at 9 pm and wake up at 4 am. Both are 8 hours of sleeping time. How can my body knows it is past 12pm and decides to give me a bad day because of it.

In: Biology

Answer 1

Your body’s internal clock, called circadian rhythm, is designed for early bed, early rise. Mess with it, you’re asking for a moody morning!