ProSleep

Stop waking up groggy. ProSleep uses the science of ultradian sleep cycles to tell you exactly when to go to bed — or when to set your alarm — so you always wake up between cycles, not in the middle of one. How it works Your sleep moves through 90-minute cycles of light sleep, deep sleep, and REM. Waking mid-cycle leaves you disoriented and tired. Waking at the end of a cycle feels natural — even after fewer hours. ProSleep calculates the ideal times for you. Two modes • Wake at — pick your wake-up time and see the best bedtimes for 4, 5, or 6 full cycles • Sleep at — pick your bedtime and see the ideal wake times Adjustable sleep onset Everyone falls asleep differently. Slide the onset time anywhere from 5 to 45 minutes so the math actually matches your body. One-time alarm unlock Want to set your alarm right from the app? Unlock the alarm feature once for $0.99 — no subscription, ever. Clean, distraction-free design No accounts. No ads. No subscription. Just the information you need to wake up feeling rested. ProSleep is built on established sleep science and designed to be the last sleep calculator you'll ever need.