SleepSyncApp

Wake up refreshed, not groggy. SleepSync calculates the perfect bedtime or wake-up time based on 90-minute sleep cycles no ads, no tracking, works fully offline.

Sleep well, wake up ready. SleepSync is a simple sleep-cycle calculator that helps you time your bedtime or wake-up based on real sleep science — so you wake up at the end of a full 90-minute cycle instead of in the middle of deep sleep. Just tell SleepSync when you want to wake up, or when you're going to bed, and it instantly shows you the best times to fall asleep — with the sweet-spot options (5-6 full cycles) clearly marked. WHY 90-MINUTE CYCLES MATTER Your body moves through sleep in cycles of roughly 90 minutes, from light sleep down to deep sleep and back up. Waking up mid-cycle — especially during deep sleep — is why you sometimes feel groggy even after "enough" hours in bed. Waking up at the end of a cycle feels completely different. FEATURES Two simple modes: "I want to wake up at..." or "I plan to sleep at..." One-tap "Sleep now" option — no need to enter a time if you're heading to bed right this second Clear results showing every option from 3 to 6 cycles, with total sleep time and the recommended sweet spot highlighted Optional local reminder notifications for your chosen bedtime or wake-up time Full English and Arabic support, including right-to-left layout Customize your average cycle length and how long it takes you to fall asleep, right from Settings PRIVATE BY DESIGN SleepSync works entirely on your device. There's no account, no login, no ads, and no data collection of any kind — nothing is ever sent off your phone. Your sleep schedule is your business. Whether you're a night owl trying to fix your schedule, a parent working around unpredictable nights, or just someone who wants to stop hitting snooze feeling half-dead, SleepSync makes it easy to plan your sleep around how your body actually works.