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Sleep tools
Five focused tools that pair with your sleep age — each answers one question in seconds.
Sleep cycle calculatorFeatured
Find the best wake-up or bedtime based on 90-minute sleep cycles. Two modes, one calculator.
Sleep debt calculator
How many hours of sleep have you lost this week? Quantify the gap and a recovery plan.
Sleep efficiency calculator
What percentage of time in bed is actually time asleep? A clinical sleep-quality metric.
Caffeine cutoff
When to stop drinking coffee so it doesn't wreck tonight's sleep.
Nap optimizer
20 minutes? 90 minutes? Match nap length to your goal.
Sleep sounds
White, pink, and brown noise — generated locally in your browser.