Sleep Science

Sleep cycles, debt accumulation, jet lag, caffeine timing, and shift work sleep scheduling.

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Calculate how much caffeine remains in your system at bedtime and when to stop drinking coffee.

Create a chronotype-based daily schedule for optimal sleep, focus, meals, and exercise.

Calculate days to adjust from timezone change with light therapy and melatonin timing recommendations.

Calculate your daily light exposure in lux-hours for optimal circadian entrainment.

Calculate the best nap length to avoid sleep inertia and achieve your energy goals.

Optimize your sleep schedule for shift work with sleep windows, nap timing, and light strategies.

Calculate optimal bedtime and wake time based on 90-minute sleep cycles to wake between cycles.

Calculate your accumulated sleep deficit and estimate how long recovery will take.

Calculate your sleep efficiency percentage — time asleep vs time spent in bed.

Rate your bedroom sleep environment across light, noise, temperature, air quality, and habits.