Sleep Calculator: Find Your Best Bedtime & Wake Times

Sleep is often organized in approximately 90-minute cycles. Planning bed and wake times around full cycles can help you wake more easily.

Latency is how long you usually take to fall asleep. Many people use 10–20 minutes. This tool lets you set 0–30 minutes.

More cycles generally mean more sleep. We highlight 5 cycles (around 7.5 hours) as a balanced recommendation.

Yes. Use the 12h/24h toggle. All displayed times will follow your selection.

Wake-up time Format: 12h

Sleep latency 15 min

12h / 24h US default: 12h

Latency Sleep cycles Bedtime → Latency → Cycles → Wake

This tool provides general guidance and does not replace medical advice.

Planned bedtime Format: 12h

Sleep latency 15 min

12h / 24h US default: 12h

Latency Sleep cycles Bedtime → Latency → Cycles → Wake

This tool provides general guidance and does not replace medical advice.

FAQ

How does the sleep cycle method work?

Sleep tends to occur in ~90-minute cycles. Waking at the end of a cycle can feel easier. We plan bed and wake times in multiples of 90 minutes.

What’s a good sleep latency to use?

Latency is how long it takes you to fall asleep. Many people use 10–20 minutes. You can set 0–30 minutes here.

Is 6, 5 or 4 cycles better?

More cycles usually means more total sleep. We highlight 5 cycles (about 7.5 hours) as a balanced recommendation.

Can I use 12-hour or 24-hour time?

Yes. Toggle the 12h/24h switch. Your selected format is used for all displayed times.