Sleep a little better tonight.
Simple, free calculators for bedtime, naps, caffeine and sleep debt. Everything runs on your device.
Sleep Calculator
Find the bedtime or wake-up time that lines up with your sleep cycles.
Nap Calculator
Pick a nap length and see when to set the alarm.
Caffeine Calculator
How much caffeine is still in you at bedtime, and your last-call time.
Sleep Debt Calculator
Add up a week of short nights and plan a realistic catch-up.
Bedtime Calculator
Age-based bedtime range for a given wake-up time.
A practical starting point
How to sleep better
Small changes to your schedule, caffeine timing, naps, and bedroom can make sleep easier to plan. Read our source-backed guide and choose a step to try tonight.
Why you can trust these tools
Private by design
All calculations happen in your browser. We never see the times or numbers you enter.
Clear about assumptions
Age ranges follow National Sleep Foundation recommendations; the 90-minute cycle is a rough planning average.
Honest about limits
These are estimates for everyday planning, not medical advice or a diagnosis.