How Many Hours of Sleep You Really Need?


Scientific research makes clear that sleep is essential at any age. Sleep powers the mind, restores the body, and fortifies virtually every system in the body.

But how much sleep do we really need in order to get these benefits?

What Is a Sleep Cycle?

When you fall asleep, your brain and body go through several cycles of sleep. Each cycle includes four distinct stages: the first stage of sleep is the period between being awake and falling asleep, in the second stage of sleep you become unaware of your surroundings, the third is the deepest and most restorative sleep stage and the last stage is the REM sleep which takes up about 25 percent of your sleep cycle.

Calculate Your Sleep Hours

On average, it takes about 90 minutes to go through each cycle. If you can complete five cycles a night, you’d get 7.5 hours of sleep a night and six full cycles are about 9 hours of sleep. You want to sleep at least 4 cycles a night to get a good night sleep and be fully awake in the morning.

Ideally, you want to wake up at the end of a sleep cycle instead of in the middle of it. You usually feel more refreshed and energized if you wake up at the end of a sleep cycle.

Need help calculating? We got you!

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