Scientific 90-Minute REM Sleep Cycle Calculator
Calculate optimal wake-up times, power nap presets, caffeine curfew countdown, and binaural audio.
Instant Launch in Browser
Zero installation required • Private client-side execution
Core Capabilities
🌙 90-Min REM Sleep Cycles
Calculate wake-up times aligned with natural sleep cycles to avoid grogginess.
⚡ Power Nap Presets
20-minute alertness nap and 90-minute full recovery nap alarms.
☕ Caffeine Curfew Timer
Determine exact cut-off time for coffee to protect deep slow-wave sleep.
How It Works
Select Target Time
Choose when you want to fall asleep or when you need to wake up.
View Optimal Cycles
Review 4 to 6 full REM sleep cycle recommendations.
Set Nap Alarm
Trigger audio chime alarms or binaural relaxation frequencies.
Frequently Asked Questions
Q: Why 90 minutes?
Human sleep naturally cycles through light, deep, and REM sleep in ~90-minute intervals.
Q: How long does it take to fall asleep?
SomnoSync factors in the standard 14-minute sleep latency average.
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