Free sleep tools
Quick, honest calculators for better nights and easier mornings. No sign-up, no ads, and everything runs privately in your browser.
Sleep cycle calculator
Find the best bedtime or alarm time so you wake up between 90-minute sleep cycles. Includes a nap calculator.
Open tool →Caffeine cut-off calculator
See how much caffeine is left at bedtime and the latest time for your next coffee, with a simple decay chart.
Open tool →Sleep debt calculator
Add up last week's missing sleep and get a gentle, realistic catch-up plan.
Open tool →Chronotype quiz
Nine quick questions to find out if you're an early bird, a night owl or in between, with an ideal daily schedule.
Open tool →
