How It Works

This calculator uses the average 90-minute sleep cycle to determine your ideal bedtime or wake-up time.
In “Wake-Up” mode, it subtracts the total sleep duration (cycles × 90 minutes + time to fall asleep) from your desired wake-up time.
In “Bedtime” mode, it adds that duration to your chosen bedtime.
The “Power Nap” mode provides options for short naps as well as a full-cycle nap suggestion.

Why Sleep Calculation Matters

• Enhances concentration and energy levels.
• Prevents grogginess by avoiding mid-cycle wake-ups.
• Optimizes your overall sleep schedule for better health.
• Supports memory, mood regulation, and physical recovery.