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Sleep Calculator

How many complete sleep cycles will you get tonight? Enter your planned sleep hours and find the ideal duration to wake up feeling refreshed.

✓ Vérifié par Julian Bronski · mis à jour juin 2026

Vos informations

Planned sleep hours 7.5

312+

Résultat

Complete sleep cycles

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Ideal sleep duration (h)

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Next cycle target (h)

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<iframe src="https://kalkulio.app/fr/sleep-calculator/embed/" style="width:100%;max-width:720px;height:505px;border:0;border-radius:16px;background:#faf9f4" title="Sleep Calculator" loading="lazy"></iframe>
<p style="margin:6px 0 0;font-size:13px"><a href="https://kalkulio.app/fr/sleep-calculator/" target="_blank">Sleep Calculator — gratuit sur kalkulio.app</a></p>

Comment fonctionne le Sleep Calculator

Human sleep occurs in cycles of 90 minutes each. Waking in the middle of a cycle leaves you groggy – it's best to wake after a complete number of cycles. Formula: cycles = ⌊hours × 60 ÷ 90⌋, ideal duration: cycles × 1.5 h.

Questions fréquentes

How long is a sleep cycle? ▾

A complete sleep cycle lasts about 90 minutes and includes light sleep, deep sleep and REM sleep. Most adults go through 4–6 cycles per night.

Why am I more tired after 8 hours than 7.5? ▾

You're probably waking in the middle of a cycle. 7.5 h (5 cycles) or 9 h (6 cycles) is better than exactly 8 h – try going to bed 15 minutes earlier.

What helps with falling asleep? ▾

Regular sleep times, darkness, a cool room (16–18°C) and no screens 30 minutes before bed are the most effective measures according to sleep research.

Ne constitue pas un conseil financier ou médical. Sans garantie.

Comment fonctionne le Sleep Calculator

Questions fréquentes

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