After reading the Two Towers this question also sprang to my mind, but I developed a different theory. I believe that elves have a brain like a dolphin when it comes to sleeping. (I hope no one takes offense to this) Dolphins don't really sleep, they kind of drift into a sub-concious state and rest, but they don't sleep. So that they don't drown. My guess is that elves do something similar-minus the water.
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