Sleep & Rest Calculators
Free sleep calculators — sleep cycles, naps, caffeine cutoff, baby sleep schedules. Every figure sourced, no signup.
Sleep Cycle Calculator Find bedtimes or wake-times that land on a 90-minute sleep-cycle boundary. Try it Nap Calculator The best nap length to avoid grogginess, and the latest time to nap without wrecking tonight’s sleep. Try it Caffeine Cutoff Calculator What time to stop caffeine, based on your bedtime and caffeine’s ~5-hour half-life. Try it Baby Sleep Schedule Calculator Typical total daily sleep by age (0–60 months), sourced to pediatric sleep guidelines. Try it