Sleep Cycle Calculator
Sleep Math
Need to wake up at a specific time, or crashing right now? This gives you the least-bad windows to aim for instead of guessing.
When do you need to be conscious again?
:
Sleeping at -
Pick a wake-up time and I'll show the bedtimes that give you the best shot at waking up like less of a corpse.
This is a rough sleep-cycle estimate, not medical truth carved into stone. The 14-minute offset is just a decent average for falling asleep. Tap any result to copy it.