Sleep Smarter.
Wake Up Refreshed.
Stop guessing your bedtime. Use our precision tools to align your sleep with your body's natural 90-minute cycles.
Popular Calculators
The most used tools by our community this month.
Sleep Cycle Calculator
Plan your rest in 90-minute intervals to wake up during your lightest sleep stage and feel instant energy.
Power Nap Calculator
Boost productivity and alertness. Calculate the exact time to wake up to avoid the 'groggy' post-nap feeling.
REM Sleep Calculator
Optimize for deep mental recovery. Find the best sleep windows to maximize your REM stages and memory.
Master Your Circadian Rhythm
We don't just give you a wake-up time. We help you understand the neurobiology of rest. By waking up at the end of a 90-minute sleep cycle, you bypass sleep inertia entirely.
90min
Natural Cycle
100%
Free Tools
✓ Science-First
Calculations based on real polysomnography sleep studies.
✓ Privacy Focused
No trackers, no sign-ups. Your sleep data stays with you.