Sleep Time Calculator: Find Your Ideal Bedtime & Wake-Up Time

Sleep happens in 90-minute cycles. Waking up mid-cycle leaves you groggy, while waking at the end of a cycle feels refreshing. Our calculator helps you find the perfect bedtime or wake-up time aligned with natural sleep cycles.

How to Use Sleep Time Calculator

• 1.

  Choose: "I want to wake up at..." or "I want to sleep at..."

• 2.

  Enter your target time

• 3.

  Factor in ~15 minutes to fall asleep

• 4.

  View suggested times for 4, 5, 6, or 7 complete cycles

Key Features

• Based on 90-minute sleep cycle science
• Accounts for average sleep onset time (14 min)
• Shows options for different cycle counts
• Works for both bedtime and wake-up planning

When to Use This Tool

• •

  Optimizing sleep for early morning routines

• •

  Shift workers planning rest periods

• •

  Students planning study-sleep balance

• •

  Anyone wanting to feel less groggy in the morning

Frequently Asked Questions