Zdrowie

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.

✓ Sprawdzone przez Julian Bronski · zaktualizowano czerwiec 2026

Twoje dane

Planned sleep hours 7.5

312+

Wynik

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/pl/sleep-calculator/embed/" style="width:100%;max-width:720px;height:505px;border:0;border-radius:16px;background:#faf9f4" title="Sleep Calculator" loading="lazy"></iframe>
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Jak działa 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.

Najczęstsze pytania

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.

To nie jest porada finansowa ani medyczna. Bez gwarancji.

Jak działa Sleep Calculator

Najczęstsze pytania

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