Sleep Smarter,
Wake Refreshed
A free sleep-tools suite: bedtime & wake-time calculator, nap calculator, sleep debt tracker, chronotype quiz, wind-down timer and ambient sounds — all in your browser, nothing to install.
Sleep Calculator
I want to wake up at…
I'm going to bed at…
Going to sleep right now?
We'll calculate your optimal wake times starting from this moment, live.
Illustrative view of light (N1/N2), deep (N3) and REM stages across your recommended cycles.
More Free Sleep Tools
Everything below runs in your browser and stays on your device — nothing is uploaded.
Nap Calculator
Pick a nap length, or enter your own — timed from right now.
Sleep Debt Tracker
Enter your hours of sleep for the last 7 days. Saved only on this device.
Recommended Sleep by Age
Based on general national sleep foundation guidance. Enter your age to highlight your band.
Chronotype Quiz
6 quick questions to find your natural sleep-wake type and ideal bedtime window.
Wind-Down / Blue-Light Timer
Set a countdown to switch off screens before bed.
Sleep Environment Checklist
Check what's already true for your bedroom tonight.
Your Sleep Architecture
Each 90-minute cycle moves through four stages, repeating 5–6 times per night.
Better Sleep Tonight
Small habits that make a real difference in sleep quality.
Consistent Schedule
Go to bed and wake up at the same time daily, even on weekends, to strengthen your circadian rhythm.
Cool, Dark Room
Keep your bedroom between 60–67°F (15–19°C) and as dark as possible for optimal deep sleep.
Digital Detox
Blue light from screens suppresses melatonin production. Put devices away at least 60 minutes before bedtime.
Caffeine Cutoff
Caffeine has a half-life of ~5 hours. Stop consuming it by early afternoon to protect deep sleep later that night.
Frequently Asked Questions
Everything you need to know about sleep cycles and this calculator