~24h
Your body clock runs on about 24 hours
Morning daylight is the strongest signal that tells it what time it is. 10–30 minutes outside soon after waking nudges it back on track.
Free sleep schedule reset calculator
Stayed up till 4? Get your reset plan in 30 seconds.
Tell Owlback when you slept and when you need to be up. You'll get a simple, timed plan for light, coffee, naps and bedtime — so tonight goes better and tomorrow starts on time.
No name or email needed. We only use these times to build your plan.
How it works
Three steps back to your rhythm
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Step 1: Tell us about last night
When you fell asleep, when you woke up, and when tomorrow has to start.
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Step 2: Get a timed plan
Morning light, a caffeine cutoff, a short smart nap and a bedtime that lines up with your sleep cycles.
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Step 3: Wake at the same time tomorrow
A steady wake-up time is what really resets your body clock — the plan is built around it.
Example plan
The day after a 4 a.m. night
Fell asleep at 오전 4:00, up at 오전 9:30, alarm at 오전 7:30 tomorrow. Here's what Owlback would suggest.
Light
Coffee
Sleep
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You're up
You slept about 5 h 30 min. Resist the urge to stay in bed — getting up now anchors your clock.
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Daylight, 10–30 minutes
Step outside within the first hour after waking. Cloudy daylight still counts; sunglasses off if you can.
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Optional nap, 20 minutes max
If you need it, nap in this window and set an alarm. Finishing before 오후 3:00 protects tonight's sleep.
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Last coffee
No caffeine after 오후 3:45 — it lingers for hours and makes falling asleep harder.
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Screens off
Dim the lights and put the phone away for the last hour. Read, stretch or take a warm shower instead.
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Lights out
Fall asleep by about 오전 12:00 and you'll finish 5 sleep cycles right before your alarm.
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tomorrow
Same time tomorrow
Get up at 오전 7:30 even if the night was short, then get daylight again soon after.
Bedtime calculator
What time should I go to bed?
Count back whole 90-minute sleep cycles from your alarm and add about 15 minutes to fall asleep. Five cycles (7½ hours of sleep) suits most adults — six is even better when you can.
| Wake up at | 6 cycles 9 h | 5 cycles 7.5 h | 4 cycles 6 h |
|---|---|---|---|
| 오전 5:00 | 오후 7:45 | 오후 9:15 | 오후 10:45 |
| 오전 5:30 | 오후 8:15 | 오후 9:45 | 오후 11:15 |
| 오전 6:00 | 오후 8:45 | 오후 10:15 | 오후 11:45 |
| 오전 6:30 | 오후 9:15 | 오후 10:45 | 오전 12:15 |
| 오전 7:00 | 오후 9:45 | 오후 11:15 | 오전 12:45 |
| 오전 7:30 | 오후 10:15 | 오후 11:45 | 오전 1:15 |
| 오전 8:00 | 오후 10:45 | 오전 12:15 | 오전 1:45 |
| 오전 8:30 | 오후 11:15 | 오전 12:45 | 오전 2:15 |
| 오전 9:00 | 오후 11:45 | 오전 1:15 | 오전 2:45 |
Bedtimes include 15 minutes to fall asleep. Cycles vary from person to person, so treat these as a starting point. Get a plan for your exact times
The science, briefly
Work with your body clock, not against it
Owlback turns a few well-established sleep basics into times you can actually follow.
~90min
Sleep comes in cycles of roughly 90 minutes
Real cycles vary from about 70 to 120 minutes, so 90 is an approximation. We use it as a rule of thumb and add 15 minutes to fall asleep.
8h
Caffeine lingers longer than it feels
A good part of an afternoon coffee is still active at bedtime. Stopping about 8 hours before bed protects your deepest sleep.
7days
Same wake-up time, every day
Sleeping in feels kind, but it shifts your clock later. Getting up at the same time — even after a bad night — is what resets it.
Owlback is a planning aid based on general sleep-hygiene guidance. It doesn't diagnose or treat anything, and every body is a little different.
FAQ
Questions night owls ask
How do I fix my sleep schedule fast?
Pick the time you need to wake up and keep it every day, even after a bad night. Get daylight within an hour of waking, stop caffeine about 8 hours before bed, keep naps under 20 minutes and before 3 p.m., and go to bed at a time that fits whole 90-minute cycles. Most people feel back on track within a few days.
What should I do after an all-nighter?
Don't sleep until the afternoon. Stay up until a reasonable bedtime, get outside in the morning, take one short nap early in the day if you need it, and have your last coffee before lunch. Go to bed a little earlier than usual and wake at your normal time tomorrow.
Is this medical advice?
No. Owlback gives general sleep-hygiene suggestions to help after an occasional late or sleepless night. It doesn't diagnose or treat sleep disorders and never recommends medication or supplements. If poor sleep goes on for weeks, talk to a doctor.
Why cycles of 90 minutes?
Sleep moves through light, deep and REM stages in cycles that last roughly 70–120 minutes. Waking at the end of a cycle usually feels easier than waking from deep sleep. 90 minutes is a useful average, not an exact rule — treat the times as a starting point.
Can't I just sleep in to catch up?
A long lie-in pushes your body clock later, which makes the next night harder too. Keeping your usual wake-up time, getting morning light and taking at most a short nap is the faster way back.
Are naps okay?
A short nap of up to 20 minutes before 3 p.m. can take the edge off without stealing from tonight. Longer or later naps make it harder to fall asleep at bedtime.
When should I stop drinking coffee?
About 8 hours before you plan to sleep. Caffeine stays in your system for hours, so an afternoon coffee can still be working when you try to fall asleep.
Do I need an account?
No. The planner works without signing up. An account will matter for the upcoming 14-day adaptive reset, which follows your progress day by day.
What happens to the times I enter?
We use them to build your plan and keep anonymous totals to improve Owlback. We don't ask for your name, and we only store your email if you choose to receive your plan or join the waitlist.
Will this fix insomnia?
Owlback is made for occasional bad nights, jet lag-like shifts and late nights that got out of hand. Ongoing insomnia deserves proper care — a doctor can help with approaches such as CBT-I.
Coming soon
The 14-day adaptive reset
A plan that adjusts every morning to how you actually slept, until your rhythm holds on its own.
- Adapts each day to last night's sleep
- Gentle morning check-ins in under a minute
- See your rhythm settle, day by day
Owlback is coming to iPhone and Android.
- Coming soon App Store
- Coming soon Google Play
Until the apps arrive, put Owlback on your home screen — it opens just like an app.
