Sleep Debt Calculator

Add up the sleep you actually got this week and compare it with what you need. You'll see your sleep debt in hours and a realistic way to pay it back without wrecking your schedule.

How it works: the CDC recommends at least 7 hours of sleep a night for adults. Your own need may be a bit higher, so you choose it above. Sleep debt here is simply the hours you needed this week minus the hours you slept. It is an estimate for planning, not a health measurement.

What sleep debt is (and isn't)

Sleep debt is the gap between the sleep you need and the sleep you get. A late night here and there is normal. A gap that builds night after night is what most people mean when they say they're running on empty. In 2024, CDC data showed that about 3 in 10 U.S. adults slept less than 7 hours on average (see Sleep by the Numbers).

Why earlier beats longer

Paying debt back with an earlier bedtime keeps your wake-up time, and your body clock, steady. A long lie-in shifts the clock later, which makes Sunday night harder and Monday morning worse. Small, regular top-ups are easier to stick with.

Make the earlier bedtime work

An earlier bedtime only helps if you can fall asleep at it. Dim the lights, put the phone away 30 minutes before bed, and give yourself a cue that the day is over. Ours is twenty warm, dark minutes under a Steam Eye Mask. For more ideas, read How to Fall Asleep Faster or take the sleep quiz.

General information, not medical advice. If you regularly can't get enough sleep, snore loudly or feel very sleepy during the day, talk to a doctor.