Sleep Health Alarm

Wake up at the end of a sleep cycle and feel refreshed, not groggy. Pick a bedtime or a wake time — we do the math instantly.

Sleep Health Alarm helps you wake up at the right moment in your sleep cycle, so you start every morning alert and refreshed.

Sleep happens in roughly 90-minute cycles, each with four stages: light sleep (N1, N2), deep sleep (N3), and REM (dreaming). If your alarm rings during deep sleep, you wake up groggy. Sleep Health Alarm times your alarm for the END of a cycle — during light sleep — so waking up feels natural and easy.

FEATURES • Bedtime mode: pick a bedtime (or "Sleep now") and get the best wake-up times based on 4–6 full cycles. • Wake-up mode: pick when you want to wake and get suggested bedtimes. • Set a real alarm straight from a suggestion — it rings even when your phone is on silent (powered by iOS AlarmKit). • Adjustable fall-asleep buffer (15 minutes by default). • Bilingual English–Vietnamese, with a calm dark interface for nighttime.

COMPLETELY FREE No ads. No in-app purchases. No account. No personal data collected — everything is calculated right on your device.

Sleep smarter and wake up better, every day, with Sleep Health Alarm.