SleepTyme™

SleepTyme calculates the best time to wake up by timing your alarm to the end of a 90-minute sleep cycle — so you wake during light sleep instead of mid-cycle deep sleep. No more grogginess. No more sleep inertia. THE 90-MINUTE RULE Sleep moves through ~90-minute cycles: light → deep → REM → light. When your alarm interrupts deep sleep, you wake disoriented and tired for the next 30+ minutes. SleepTyme lines your wake time up with the END of a cycle — when you're naturally already in light sleep — so getting up feels effortless. NIGHT SLEEP CALCULATOR Enter a bedtime, get four ranked wake times: Optimal, Great, Good, Minimum. Each shows duration, cycle count, and a visual breakdown of deep / REM / light sleep phases. AGE-SPECIFIC SCIENCE • Adult (18+): 90-min cycles, 14-min sleep onset, 22% deep / 28% REM • Teen (13–17): 90-min cycles, 20-min onset (circadian delay), tuned for 8–10 hr sleep • Infant (0–12 mo): 50-min cycles, REM-dominant — parents use it to plan baby's wake time OPTIMAL NAP MODE Five science-backed nap durations: • Power Nap (20 min) — pure light sleep, zero grogginess, NASA's 34% alertness boost • Short Nap (30 min) — touches deep sleep for memory consolidation • Danger Zone (45 min) — WARNING, wakes you mid-deep-sleep • Full Cycle (90 min) — complete restoration • Recovery Nap (120 min) — sleep debt rescue SMART WAKE-UP ALARM Tap "Set Alarm" on any wake time. SleepTyme rings at the exact moment, even when your phone is locked or on silent. The chime starts soft and gradually fades to full volume over 30 seconds — designed to wake you gently, not jolt you upright. QUICK ALARM Need an alarm for a specific time, not a calculated wake? One tap, spin the wheel, done. SLEEP SOUNDS Drift off to calming ambient audio — Deep Night or Ocean Waves. Keeps playing while your phone is locked and hands over to your wake-up alarm in the morning. Free for everyone. PRIVACY-FIRST No accounts. No analytics. No third-party SDKs. No data leaves your device. FREE TO USE Night Sleep calculator with Adult mode is free forever. SLEEPTYME PRO — 7-DAY FREE TRIAL, THEN $3.99/YEAR • Smart wake-up alarm with gradual fade-in • Infant and Teen modes • Full Optimal Nap mode with alarm • Quick Alarm for any wake time Start with a 7-day free trial, then $3.99/year. Cancel anytime. No ads. Privacy Policy: https://sleeptyme.app/privacy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/