As for the whole blinking or not blinking thing...the people that I know who sleep with one eye open don't really blink their open eye. Therfore I would guess that the elves wouldn't really blink in their "sleep" either.
I'm not saying that I totally know what I'm talking about here but...maybe their eyes don't dry out because even though they don't rest their eyes when they sleep they do at other times. Is there any mention of anything like that?

Star Gazer, I would love to hear your theory. So sometime when you get time (if you want to) please make that thread.

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Perhaps every single elf doesn't sleep with his/her eyes open every single time. Has anyone thought of that? Tolkien said, as is the way with elves, but that's a bit vague.

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