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SleepCalculatorApp

🇺🇸 English
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    Find Your Ideal Sleep and Wake Time

    Choose your desired wake up time or bedtime:

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    What time do you want to wake up?

    What time do you want to go to bed?

    How to Use the Sleep Calculator

    Follow these steps to find your optimal sleep and wake-up time based on 90-minute sleep cycles:

    • Choose your desired wake-up time or bedtime.
    • The calculator will compute several recommended times based on full sleep cycles (each about 90 minutes).
    • Pick one that fits your schedule to wake up feeling refreshed.

    Scientific Knowledge of Sleep Cycles

    Healthy sleep is composed of several repeating 90-minute cycles including light sleep, deep sleep, and REM sleep. Completing full cycles helps you avoid waking during deep sleep stages, which can cause grogginess.

    • REM sleep is crucial for memory and mood regulation.
    • Each night should include 5–6 full cycles to feel fully rested.
    • Interrupted cycles can lead to sleep debt and reduced cognitive function.

    Testimonials

    Wall of Love

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    SleepyCat

    Night Owl

    Sleep Calculator helped me figure out exactly when I should go to bed to wake up refreshed. The 90-minute cycle logic just works—no more groggy mornings!

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    Emma

    College Student

    With early morning classes, timing my sleep was a nightmare. This app takes the guesswork out and tells me the best times to sleep or wake up. It’s so helpful!

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    JamesK

    Tech Professional

    I travel a lot and struggle with jet lag. Sleep Calculator lets me reset my sleep cycle quickly by choosing optimized sleep windows based on local time.

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    Nora

    Nurse

    Night shifts are tough, but this tool helps me optimize short naps and recovery sleep. I feel more alert now.

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    Leo

    Startup Founder

    I work late nights and need to be sharp every morning. This app helps me maximize quality rest even with limited hours.

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    Hannah

    Fitness Coach

    Quality sleep is essential for recovery. I recommend Sleep Calculator to my clients—it really helps!

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    Daniel

    Journalist

    With unpredictable deadlines, I rely on this tool to calculate the best nap or wake-up time.

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    Ivy

    Designer

    I love how intuitive the tool is. Just set a time and it does the rest. It’s a staple in my bedtime routine now.

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    Jason

    Remote Worker

    Working across time zones used to mess up my sleep. This app keeps me on track.

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    Ava

    New Mom

    Every minute of rest matters. Sleep Calculator helps me plan short but effective sleep cycles.

    FAQ

    Frequently Asked Questions

    Here are some of the most frequently asked questions.

    What is the 90-minute sleep cycle rule?

    Each sleep cycle lasts about 90 minutes. Waking at the end of a cycle helps you feel more alert and rested.

    How many sleep cycles should I get per night?

    Most adults need 5–6 cycles per night, totaling about 7.5 to 9 hours of sleep.

    What time should I go to bed if I wake up at 7 AM?

    You should go to bed at 11:00 PM, 9:30 PM, or 8:00 PM depending on how many full cycles you want to complete.

    Can I use this calculator to catch up on sleep?

    Yes, though it's best used for optimizing sleep timing rather than compensating for long-term sleep debt.