Sleep Calculatorのしくみ
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.
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.
入力項目
h
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計算結果
Complete sleep cycles
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Ideal sleep duration (h)
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Next cycle target (h)
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よくある質問
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.
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