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               1. Why do we need to sleep? 

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               1. Why do we need to sleep? 

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Sleep is an essential function1 that allows your body and mind to recharge, leaving you refreshed and alert when you wake up. Healthy sleep also helps the body remain healthy and stave off diseases. Without enough sleep, the brain cannot function properly.

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You might be surprised to hear that some people sleep with their eyes open. And it's more common than you'd expect. About 20% of people do it, including babies. Doctors call this condition "nocturnal lagophthalmos." If you have it, you can usually close your eyes most of the way when you sleep, but not completely.

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1) https://www.sleepfoundation.org/how-sleep-works/why-do-we-need-sleep#:~:text=Sleep%20is%20an%20essential%20function,the%20brain%20cannot%20function%20properly.

2) https://www.webmd.com/sleep-disorders/sleep-eyes-open#:~:text=You%20might%20be%20surprised%20to,you%20sleep%2C%20but%20not%20completely.

3) https://www.healthline.com/health/oversleeping#oversleeping-causes

4) https://pubmed.ncbi.nlm.nih.gov/7690981/

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3-Why do we need to sleep 9 to 10 hours? 

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3-Why do we need to sleep 9 to 10 hours? 

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People with hypersomnia might require as many as 10 to 12 hours of sleep per night to feel their best. Since day-to-day life might include responsibilities that don't allow for this much rest, long sleepers may feel excessively tired during the day and catch up on off days, sleeping as much as 15 hours at a time.

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4 If anyone is asleep would he feel the pain? 

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4 If anyone is asleep would he feel the pain? 

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The results indicate that although pain is rare in dreams, it is nevertheless compatible with the representational code of dreaming. Further, the association of pain with dream content may implicate brainstem and limbic centers in the regulation of painful stimuli during REM sleep.