Sleep repeats in roughly 90-minute cycles — light sleep, deep sleep, then REM. This app works out bedtimes and wake-up times that land at the end of a cycle, so you wake up refreshed. Sleep now and wake when? Or wake at a set time and go to bed when? Both, at a glance.
Enter a bedtime or a target wake-up and you get recommended times aligned to the end of a cycle. It even accounts for how long you take to fall asleep, so the math starts when you actually drift off.
Enter a bedtime (or just "now") and get wake-up times at the end of each cycle, with today/tomorrow labels and time remaining.
Enter your target wake-up time and get reverse-calculated bedtimes, adjusted for how long you take to fall asleep.
See a night's sleep depth for the option you picked, visualized as a hypnogram.
Wake-up times for 10, 20, 30, 60, and 90 minute power naps, with one-tap hand-off to your device alarm app.
Log nights with quality and notes, and see a 7-day dashboard of missed sleep, average sleep, and goal streaks.
Bedtime consistency score, weekday averages, average bed and wake times, quality trends, and a 10-week heatmap.
Every record and setting is stored only on your device and never sent anywhere. There's no account or login — just open it and go, even offline. Korean and English, with light and dark themes.
Cycle-aligned bedtimes and wake-ups, power naps, and sleep-debt tracking — all in one app.
📲 Get it on Google Play