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Better sleep starts with better timing.
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CalculatorSleep
Sleep
Calculator
Plan your sleep around 90-minute cycles to wake up refreshed, not groggy. Tell us when you want to wake up — or go to bed — and we’ll do the math.
Science-backedBased on 90-minute sleep cycles
PersonalizedAdjusted to your unique needs
OptimizedBetter sleep, better days ahead
When do you want to wake up?
07
:00
How sensitive are you to caffeine?
Your optimal bedtimes
Based on 90-minute sleep cycles for a 7:00 AM wake up
9:45 PM(9h)Best
11:15 PM(7.5h)
12:45 AM(6h)
2:15 AM(4.5h)
Most people sleep best with 6 cycles (9 hours).
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Illustrative estimates based on user-reported improvements — how much deeper, cooler, and less interrupted sleep can feel. Not a clinical measurement; results vary. Recommendations are based on your answers. Restord may earn a commission if you buy through our links — it never affects what we recommend.
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How it works
Backed by sleep science
90-minute cyclesYour sleep moves through 90-minute cycles through the night.
Complete cyclesWaking at the end of a cycle feels more natural and refreshing.
Better daysAligned cycles = deeper sleep, more energy, better mood.
Your next step
Build your perfect sleep setup — up to 50% off.
Take the free 2-minute assessment and get a personalized system matched to your answers, plus reader pricing on top-rated products.