SleepTyme™
Smart Sleep Cycle Alarm
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
The smart alarm that wakes you gently — fades in from a whisper to full volume over 30 seconds so you wake refreshed, not jolted.
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/
Ratings & Reviews
The developer, SNE INTERACTIVE LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- SNE INTERACTIVE LLC
- Size
- 3.5 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- SleepTyme Pro $3.99
- Copyright
- © 2026 SNE Interactive LLC