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Sleep Cycle Calculator

🌙 Recommended Bedtimes (Includes 15 min to fall asleep)

09:45 pm6 Cycles (9.0 hrs)
11:15 pm5 Cycles (7.5 hrs)Optimal
12:45 am4 Cycles (6.0 hrs)
02:15 am3 Cycles (4.5 hrs)

Saved Scenarios

🔒 Saved locally in your browser. Never sent to a server.

No saved scenarios yet. Click "+ Save Scenario" to store current inputs.

यह टूल सामान्य जानकारी प्रदान करता है और पेशेवर चिकित्सा सलाह का विकल्प नहीं है। व्यक्तिगत चिकित्सा निर्णयों के लिए हमेशा किसी योग्य चिकित्सक से परामर्श लें।

हमारे पूरे अस्वीकरण और शर्तें पढ़ें.

🔌 अपनी वेबसाइट पर यह Sleep Cycle Calculator एम्बेड करें

ब्लॉग, गाइड और टूल के लिए मुफ़्त, उत्तरदायी और मोबाइल-अनुकूल HTML विजेट।

अक्सर पूछे जाने वाले प्रश्न

How long is a natural human sleep cycle?

An average human sleep cycle lasts approximately 90 minutes, progressing through NREM (light and deep sleep) into REM (rapid eye movement) sleep.

Why do I feel groggy even after sleeping 8 or 9 hours?

Sleep inertia (grogginess) occurs when your alarm wakes you up in the middle of deep NREM sleep. Waking at the end of a completed 90-minute cycle leaves you feeling energized.

How many sleep cycles should I get per night?

Most healthy adults require 5 to 6 completed sleep cycles per night (7.5 to 9 hours of restorative sleep).

How long does it take the average person to fall asleep?

Sleep studies show the average person takes 14 to 20 minutes to fall asleep after getting into bed. This calculator adds 15 minutes to all recommended times.

Is sleeping 6 hours (4 cycles) sufficient?

While 6 hours completes 4 full sleep cycles, it is considered the minimum threshold for adults. Chronic 6-hour sleep can lead to cumulative sleep debt.

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