Hahaha, well good question! :P I just ask because in the book it 说 that Legolas was like 唱歌 to himself, etc, instead of sleeping. But I wasn't sure if that was just a one off 或者 if elves just don't sleep?
Sort of, but not in the way humans do. Elves rest 由 looking at beautiful things to refresh their minds, 或者 providing themselves with 'waking-dreams' of beautiful things. They don't close their eyes, but their eyes glaze over. A sleeping elf would look like a human gazing into the middle distance. They also don't need to sleep as much as humans do. I think an elf could last without his waking-sleep for a few days, but this might cause some discomfort.
actually, in chapter VI of book three (two towers), the first paragraph first page, it says "Legolas and Gimli slept; Aragorn lay on his back" Elves do sleep :)
I sincerely hope they do. They are elves, not Cullens. I have read fanfictions which imply otherwise, but I think the idea is ridiculous. Elves must sleep.