How does this bedtime calculator work?
Many people use a practical estimate of ~90 minutes per sleep cycle. This tool suggests multiple bedtimes so you can pick the option that fits your night. We also add a “time to fall asleep” buffer (10–45 minutes) because most people don’t fall asleep instantly.
Which option is best?
In general, 5–6 cycles tends to feel better than 3–4, but everyone is different. Keep your wake-up time consistent and test what works for you.
FAQ
Is the 90-minute cycle exact? No — it’s an estimate and varies by person/night.
Why include time to fall asleep? It makes the recommendation more realistic.
Can this diagnose sleep problems? No. This is informational only.