Hi chloe
There are many reason why we close our eyes when we sleep but one of the main ones is that in order to regulate our sleep we need the room to be dark, closing your eyes can help cut out light. Closing our eyes also protects them and stops them from drying out and also we don’t need to be able to see when we are asleep. There are however, some people who don’t close their eyes when they are asleep (and they are definitely asleep) so it is possible to sleep with your eyes open.
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