Why does the sleep need not accumulate proportionately from previous days where we didn’t sleep enough?

Question

If you slept only 4 hours the previous day and you got a good night’s rest the next day, you don’t wake up 12 hours later but rather about 8-9.

In: Biology

Answer 1

I think your question is slightly flawed. You don’t wake up at a certain time because that’s all the sleep you needed, but instead you wake up due to a natural cycle within your body called the circadian rhythm.