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⚡ 100% Free • No Sign-Up • Evidence-Based Science
Free Bedtime Calculator — What Time Should I Go to Sleep?
Free online bedtime calculator. Find out exactly when to sleep to wake up refreshed and full of energy.
✨ 100% Free Tool: Direct Bedtimes based on 90-minute sleep cycles (7.5 Hours = 5 Cycles | 9 Hours = 6 Cycles).
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Why Use Our Free Sleep Calculator?
Free online bedtime calculator. Find out exactly when to sleep to wake up refreshed and full of energy. Aligning your alarm with natural sleep cycles prevents sleep inertia and morning grogginess.
| Target Wake Time | 5 Cycles (7.5h) | 6 Cycles (9.0h) | Status |
|---|---|---|---|
| 6:00 AM | 10:15 PM | 8:45 PM | Optimal |
| 7:00 AM | 11:15 PM | 9:45 PM | Optimal |
| 8:00 AM | 12:15 AM | 10:45 PM | Optimal |
People Also Ask (PAA)
❓ Is this sleep calculator completely free?
Yes! Our sleep calculator is 100% free with no subscription, credit card, or email sign-up required.
❓ How does the 90-minute sleep cycle formula work?
Human sleep alternates between Light, Deep (Slow Wave), and REM sleep in ~90-minute loops. Waking up at the end of a cycle feels smooth and effortless.