Sleep Timing Tools

Free calculators for bedtime, wake time, sleep cycles, caffeine cutoff, and nap length. All based on established sleep science — no account needed.

Sleep Cycle Calculator

Enter your wake time and find the optimal bedtimes based on complete 90-minute sleep cycles.

Bedtime Calculator

Age-adjusted bedtime recommendations. Find when to sleep based on when you need to wake up.

Wake Up Time Calculator

Enter your bedtime and find the best alarm times — timed to the end of a complete sleep cycle.

Caffeine Cutoff Calculator

Find the latest safe time to drink coffee based on caffeine half-life and your metabolic sensitivity.

Nap Duration Calculator

How long should you nap? Get the right nap length for your goal — alertness, memory, or recovery.

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