What Time Should I Wake Up?
Answer first: count back from your bedtime in 90-minute cycles. Enter yours and get the exact wake times.
Use What Time Should I Wake Up? ↓Sleep Cycle Calculator
Find the best times to fall asleep or wake up based on 90-minute sleep cycles. Waking between cycles helps you feel refreshed instead of groggy.
Recommended Bedtimes
The Short Answer
Count forward from the moment you actually fall asleep in blocks of 90 minutes, and set your alarm at the end of a block. Five blocks (7.5 hours) or six blocks (9 hours) suit most adults. Waking at hour eight sounds virtuous, but it usually lands mid-cycle — in deep sleep — which is why an 8-hour night can feel worse than a 7.5-hour one.
The calculator above does the counting for you, including the ~15 minutes an average adult takes to fall asleep.
Why the Wake Time Matters More Than the Duration
Through the night you cycle through light sleep, deep sleep and REM roughly every 90 minutes. Wake during light sleep at the end of a cycle and you surface easily; wake mid-cycle from deep sleep and you get sleep inertia — the leaden, coffee-proof grogginess that can last up to an hour. Two people can sleep the same number of minutes and feel completely different at the alarm purely because of where in the cycle it fired.
Anchor the Wake Time, Not the Bedtime
Sleep scientists consistently find a fixed wake time is the single most powerful scheduling habit. Your circadian clock calibrates on morning light; a wake time that swings by hours on weekends is self-inflicted jet lag. Pick a wake time you can hold seven days a week, then use our bedtime calculator to work the other direction on nights you need more recovery.
Frequently Asked Questions
What time should I wake up if I go to bed at 11pm?
Allowing 15 minutes to fall asleep, waking at 6:45am gives you five full 90-minute cycles; 8:15am gives you six. Both beat 7:30am, which would interrupt a cycle midway and leave you groggy.
Is it better to wake up earlier or sleep longer?
Completing cycles beats raw duration for how you feel on waking. Waking after 7.5 hours (5 full cycles) usually feels better than waking after 8 hours mid-cycle, though total weekly sleep still matters most for health.
Why do I feel worse after sleeping longer?
You likely woke during deep sleep in the middle of a cycle. This causes sleep inertia, the heavy grogginess that can last up to an hour. Waking at a cycle boundary avoids it.
What time should I wake up for a 9am start?
Working back: waking at 7:30am gives time to get ready, so count cycles from there. Fall asleep by 11:45pm for five cycles or 10:15pm for six.
Does everyone have 90-minute sleep cycles?
Cycles range from about 80 to 110 minutes and lengthen slightly through the night. 90 minutes is a working average; treat calculated times as targets, then adjust a few days in either direction to find yours.