Our eyelids do block stimuli (light) from entering our eyes, but they can't do it completely. That's why when we are facing the sun or a light with our eyes closed we seem to see some color/colors
So yes, we can see through our eyelids, a little. However, during sleep, our eyes are actually shut off temporarily by our brains. The main reason our eyes close for sleep is so that they do not dry out.
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