What is the best time to wake up?

The best wake-up time is at the end of a complete 90-minute sleep cycle, not in the middle of one. For most adults, that's after 5 cycles (7.5 hours) or 6 cycles (9 hours). Enter your bedtime into this calculator to find your optimal wake-up time.

What time should I wake up if I go to bed at 11pm?

If you go to bed at 11:00 PM, allowing 14 minutes to fall asleep, you complete 5 sleep cycles by 6:44 AM. For 6 cycles, wake at 8:14 AM. For 4 cycles, wake at 5:14 AM. The calculator above adjusts for any bedtime.

Wake Up Calculator

Enter the time you're going to bed. We'll calculate the best times to wake up so you finish at the end of a 90-minute sleep cycle — not in the middle of deep sleep.

Wake-up scene with an alarm clock ringing at 6 AM and golden sunrise rays through curtains

💤 Quick nap calculator

How wake-up time is calculated

The calculator adds 14 minutes for sleep onset, then counts forward in 90-minute increments. The four options you get back are:

3 cycles / 4.5 hours — emergency. Survive the night.
4 cycles / 6 hours — minimum viable, you'll feel it by mid-afternoon.
5 cycles / 7.5 hours — recommended. Wake feeling like a person.
6 cycles / 9 hours — full rest. Best when you've been under-sleeping.

Why you can't train yourself to need less

The "I only need 5 hours" crowd is mostly wrong. Van Dongen's 2003 meta-analysis showed that adults who consistently sleep 6 hours or fewer for two weeks perform as badly on cognitive tests as people who are legally drunk — even though they feel subjectively alert. There's no adaptation. The deficit accumulates silently.

If you have to wake up before 6 cycles

Sometimes life requires it. Two mitigations: (1) set your alarm for a cycle boundary, not for a specific time — your body will tolerate waking between cycles much better. (2) take a 20-minute power nap at the circadian dip (1–3 PM) the next day to recover a fraction of the deficit. You won't fully repay the debt, but you will function.

Going the other direction — given a wake-up time, what's my bedtime? Use the bedtime calculator.