Ah, sweet sleep. From the quick catnap to the full drool-and-snore session, we humans cherish our sleepy time. But how much sleep is enough? Does everybody need the same amount? Does a person’s amount change as they age? Is it nap time yet? We asked sleep scientist Ketema Paul to help us find the answers.

Got a question that’s keeping you up at night? Send it to us at BrainsOn.org/contact, and we’ll help put it to bed.