Sleep timing for real schedules.
Free science-based calculators that help shift workers, travelers, and anyone with an irregular schedule optimize their rest.
Four ways to optimize your sleep
Choose the calculator that fits your lifestyle and schedule constraints.
Shift Worker
Optimize sleep around irregular work schedules including nights, rotating shifts, and split schedules.
Calculate nowNap Planner
Find the ideal nap timing and duration to boost alertness without disrupting nighttime sleep.
Plan your napSleep Cycles
Wake up refreshed by aligning your alarm with natural 90-minute sleep cycles.
Find your cyclesJet Lag Planner
Adjust your circadian rhythm before and after travel to minimize jet lag symptoms.
Plan your tripBuilt for constraints
Real tools for people who can't follow textbook sleep advice.
Science-backed
Algorithms based on circadian rhythm research and sleep science, not generic advice.
Fully customizable
Input your exact schedule, preferences, and constraints for personalized recommendations.
Private & free
No accounts required. Your data stays on your device. Completely free to use.
Instant results
Get actionable sleep windows and wake times in seconds, not after days of tracking.
For workers who need real solutions
Specialized calculators for specific shift patterns and professions.