Why is it so hard to fall asleep at night after being awake for hours but so easy to fall back asleep in the morning after just waking up and getting some hours of sleep?

Question

Why is it so hard to fall asleep at night after being awake for hours but so easy to fall back asleep in the morning after just waking up and getting some hours of sleep?

In: Biology

Answer 1

Wait. It is the opposite for me! Wtf?
Once I wake up I’m up.