This calculator is for informational purposes only and does not constitute medical advice. Results are estimates based on general formulas. Consult a qualified healthcare professional before making health decisions.
Sleep Cycle Calculator
Wake up feeling refreshed by syncing with your natural sleep cycles.
Your Details
Includes avg. 14 min to fall asleep.
Enter a time to calculate perfect cycles.
Why Cycles Matter
Sleep consists of 90-minute cycles where brain activity fluctuates between deep sleep (NREM) and dreaming (REM). Waking up in the middle of a deep sleep cycle leads to grogginess (sleep inertia). Waking up at the end of a cycle ensures you feel refreshed and alert.