Sleep Calculator
Wake up at the end of a sleep cycle to feel refreshed
How It Works
Sleep happens in cycles of about 90 minutes. Waking up mid-cycle leaves you groggy, while waking at the end of a cycle helps you feel refreshed.
A typical night includes:
- • 5-6 cycles = 7.5 - 9 hours (ideal)
- • 4 cycles = 6 hours (minimum for most adults)
- • 3 cycles = 4.5 hours (short night)
💡 Tip: Keep a consistent sleep schedule — even on weekends — to optimize your natural circadian rhythm.