Calculating sleep,
made simple.
See how long you slept, or plan tonight around your alarm. Change a time and get the answer instantly.
How long did you sleep?
Change either time. Your estimate updates instantly.
Include time awake during the night
Fine-tune the plan
What do you need right now?
Choose a question. Your usual sleep preferences follow you.
How did this morning feel?
A ten-second check-in helps you notice which bedtime windows work. Everything stays in this browser.
Choose how you felt after waking today.
Check in for a few mornings and we’ll help you notice a gentler bedtime direction.
Useful enough to guide you.
Quiet enough to close.
No streak pressure. No bright dashboard. Just a quick answer for last night and a flexible plan for tonight.
A few things worth knowing
Why is bedtime shown as a window?
Falling asleep and sleep timing naturally vary. A short window is more useful and honest than claiming one perfect minute.
Are sleep cycles always 90 minutes?
No. NIH describes cycles commonly restarting every 80–100 minutes, and timing can change across a night. We use cycle timing only as an adjustable planning estimate.
What does calculating sleep include?
A useful estimate considers the time between falling asleep and waking, time awake during the night, and the amount of sleep you tend to need.