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Sleep Calculator
Wake up refreshed by completing full sleep cycles
Go to sleep at…
9:46 PM
🌟 Ideal
6 cycles (9h) · 9h sleep
11:16 PM
😊 Good
5 cycles (7.5h) · 7h 30m sleep
12:46 AM
👍 OK
4 cycles (6h) · 6h sleep
2:16 AM
😐 Short
3 cycles (4.5h) · 4h 30m sleep
3:46 AM
😴 Too short
2 cycles (3h) · 3h sleep
• Sleep cycles last approximately 90 minutes each
• Average time to fall asleep: 14 minutes (already factored in)
• Waking up at the end of a cycle means less grogginess
• Most adults need 5–6 complete cycles (7.5–9 hours)