What Time to Go to Sleep to Wake Up at 6:30 AM?
To wake at 6:30 AM after 5 sleep cycles, you should fall asleep by approximately 11:00 PM.
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How to use this tool
- Enter wake-up time and sleep cycles in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your bedtime and the full breakdown beneath it.
Timing your sleep to complete full 90-minute cycles helps you avoid waking mid-cycle feeling groggy.
Frequently asked questions
- How long is a sleep cycle?
- Each sleep cycle lasts approximately 90 minutes, moving through light sleep, deep sleep, and REM. Most adults complete 4–6 cycles per night.
- How many hours of sleep do I need?
- Adults generally need 7–9 hours (roughly 5–6 cycles). Teenagers need 8–10 hours; children need more.