it said that he rested while they were actually moving 'letting his mind wander in the strange paths of elvish dreams' or some such, i don't have it with me. That sounds like they just switch their minds to a different circuit or something.
later in the book everyone else is going to bed and legolos says that to walk in the woods/fields/something will be enough rest, perhaps nature sort of succours elves?
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Not another ****ing Elf!
~C.S.Lewis
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