Free sleep tools
Sleep science shouldn't be locked inside an app. Three front-end calculators — run the numbers, understand the why, try it tonight.
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Caffeine Cutoff Calculator
Find the latest time you can have coffee without it stealing your night.
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Bedtime Calculator
Work backwards from your wake-up time to a bedtime that respects sleep latency.
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Sleep Cycle Calculator
Plan 90-minute cycles so you wake between waves, not in the middle of one.