Circadian: Sunrise Sleep

Calculate your ideal bedtime based on local sunrise. No wearables, no subscriptions — just your natural rhythm.

Circadian tells you exactly when to go to sleep so you can wake up with the sunrise. Instead of guessing your bedtime, Circadian calculates tomorrow's sunrise for your exact location and subtracts your preferred sleep duration. The result is a simple, personalized countdown to your ideal bedtime.

KEY FEATURES • Sunrise-based bedtime calculator using your GPS location • Real-time countdown to your optimal sleep time • Choose your sleep duration: 8, 9, or 10 hours • Clean, minimal design with no clutter • No account required — start as a guest instantly • Optional account upgrade to secure your data HOW IT WORKS

1. Open the app and grant location access
2. Circadian calculates your local sunrise time
3. See your personalized bedtime and countdown
4. Go to sleep on time, wake up with natural light Whether you are into biohacking, optimizing your circadian rhythm, or simply want more energy in the morning, Circadian gives you the one number that matters: your bedtime. No wearables. No subscription. No complicated charts. Just your bedtime, calculated by nature.

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