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NutraJeev

Sleep Calculator

Calculate optimal bedtimes and wake times based on sleep cycles

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Find Your Perfect Sleep Schedule

Based on 90-minute sleep cycles + 15 minutes to fall asleep

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About This Tool

Calculate your optimal sleep schedule based on 90-minute sleep cycles. This calculator helps you find the best bedtime or wake-up time to wake up feeling refreshed, not groggy. By aligning with your natural sleep cycles, you can improve sleep quality and daytime energy.

Frequently Asked Questions

What are sleep cycles?
Sleep cycles are approximately 90-minute periods during which your brain progresses through different sleep stages: light sleep, deep sleep, and REM sleep. Waking up at the end of a cycle (during light sleep) helps you feel more refreshed.
Why 90 minutes per cycle?
Research shows that the average adult completes a full sleep cycle in about 90 minutes. This includes all sleep stages. The exact duration can vary between 80-110 minutes per person, but 90 minutes is a reliable average for most people.
How many sleep cycles do I need?
Most adults need 5-6 sleep cycles per night (7.5-9 hours). Teenagers may need 6-7 cycles (9-10.5 hours). The quality of sleep matters as much as quantity - completing full cycles is key to feeling rested.
What if I don't get enough sleep cycles?
Incomplete sleep cycles can lead to sleep inertia - that groggy feeling when you wake up. If you must cut sleep short, try to wake up after a multiple of 90 minutes (e.g., 6 hours = 4 cycles) rather than in the middle of a cycle.

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