Free Sleep & Caffeine Tools
Science-backed calculators to help you sleep better and optimize your caffeine intake.
🌙 Sleep Cycle Calculator
Find your perfect bedtime or wake-up time based on 90-minute sleep cycles. See how caffeine affects your sleep windows.
☕ Coffee Timing Calculator
Discover the best times to drink coffee based on your cortisol rhythm. Stop wasting caffeine during cortisol peaks.
📊 Caffeine Half-Life Calculator
Track exactly how much caffeine is in your system right now. Visualize the decay curve and know when you’re clear to sleep.
😴 Nap Calculator
Find the perfect nap length — from NASA-approved 26-minute power naps to full 90-minute recovery cycles.