Sleep Cycle Calculator

Wake up refreshed. Find the ideal bedtime or wake-up time aligned to your 90-minute sleep cycles.

😴 Calculate sleep times

Wake-up time

🌙 Bedtimes

💡 Sleep science tip: It takes about 14 minutes to fall asleep. Each 90-minute cycle includes both light/deep sleep and REM stages. Waking mid-cycle causes grogginess — aim for 5 or 6 complete cycles (7.5–9 hrs) for best results.
⚕️ Medical Disclaimer: This tool is for informational and educational purposes only and does not constitute medical advice, diagnosis, or treatment. Results are estimates based on population averages and may not reflect your individual circumstances. Always consult a qualified healthcare professional before making decisions about your health, diet, fitness, or medication. Do not use this tool as a substitute for professional medical care.
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