I want to go to sleep now...
How Sleep Calculator Works
Science Behind Sleep Cycles
This bedtime calculator helps you align with natural 90-minute sleep cycles. During each cycle, your body moves through different sleep stages, from light sleep to deep sleep and REM (Rapid Eye Movement) sleep. Waking up at the end of a cycle, rather than in the middle, helps you feel more refreshed.
Three Ways to Calculate
- Plan Your Wake-Up Time: Enter when you want to wake up, and we'll show you the best times to go to bed to complete full sleep cycles.
- Plan Your Bedtime: Enter when you plan to go to bed, and we'll recommend optimal wake-up times that align with your sleep cycles.
- Calculate from Now: Going to bed soon? Click this option to see the best times to wake up based on your sleep cycles starting now.
Recommended Sleep Duration
For optimal rest, aim for 7-9 hours of sleep, which equals 4-6 complete sleep cycles. Our calculator helps you achieve this by suggesting times that align with your natural sleep patterns.
Learn More About Sleep
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How Much Sleep Do You Need?
Discover the optimal amount of sleep for your age group and lifestyle.
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Understanding REM Sleep
Learn about the importance of REM sleep and its role in your sleep cycle.
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Tips to Fall Asleep Faster
Practical strategies to help you fall asleep more quickly and improve sleep quality.
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How to Reset Your Sleep Schedule
Effective methods to adjust your sleep pattern and establish a healthy routine.
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Why Can't I Sleep?
Discover the reasons why you may be having trouble sleeping and how to overcome them.
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What is Insomnia?
Learn about the different types of insomnia and how to treat them.
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What Time Should I Go to Bed?
Discover the best time to go to bed based on your sleep cycles.
Frequently Asked Questions
How does the Sleep Calculator determine bedtimes?
Our calculator works by counting back in 90-minute sleep cycles from your wake-up time, accounting for average time to fall asleep.
What is a 90-minute sleep cycle?
A 90-minute sleep cycle is the average length of one complete cycle through different sleep stages (light, deep, REM). Waking up at the end of a cycle helps you feel refreshed.