Calculate bedtime or wake-up options aligned with approximate sleep cycles.
Version 1.0 · Last Updated: August 6, 2026 · Maintained by ToolLarder
Choose how long you usually need to fall asleep after getting into bed.
This planning estimate uses approximate 90-minute cycles; actual sleep cycles commonly vary from about 80–100 minutes. Healthy adults are advised to regularly get at least 7 hours of sleep.
This calculation is not a substitute for medical advice.