Sleep Cycle Calculator : What Time to go to bed and wake up ?

Sleep Calculator

This sleep calculator will help you find the best bedtime for you, by maximizing your full sleep cycles. Sleep consists of 90-minutes-long sequences, repeated throughout the night. You’ll wake up feeling better if you wake up at the end of a cycle, rather than in the middle of it, so use this calculator to find out what time you should go to sleep if you want to wake up refreshed and alert. And if you are still wondering how important it is to get the right amount of sleep, check how deadly your current sleeping routine is!

If you’re interested in how much sleep we need at different ages, whether 6 hours of sleep is enough, what our natural sleep pattern is and what are good sleep habits – keep scrolling and you’ll find the answer.

What are sleep cycles and stages of sleep?

While sleeping, our brains go through several sleep cycles. An average person needs 5-6 cycles to feel fully regenerated in the morning. One sleep cycle lasts around 90 minutes and consists of 5 stages: the first four stages are non-REM stages, where stage 1 and 2 are known as light sleep stages, stage 3 (and 4 in the previous definition) are deep sleep stages, and the last one is REM (rapid eye movement) sleep.

The duration of each stage oscillates between 5 and 15 minutes. Early in the night, stages of deep sleep are longer than REM sleep, but this swaps round as the night progresses. People’s brains usually don’t go from stages 1 to 5, but rather: stages of light sleep, stages of deep sleep, REM, and then back to stages of light sleep and stages of deep sleep.

 

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