"Legolas already lay motionless, his fair hands folded upon his breast, his eyes unclosed, blending living night and deep dream, as is the way of elves...Gimli was still deep in slumber, but Legolas was standing, gazing northwards into the darkness, thoughtful and silent as a young дерево in a windless night (p. 445)...As before Legolas was first afoot, if indeed he had ever slept" (p 447). Apparently, he can even sleep while he is walking around, "Only Legolas still stepped as lightly as ever, his feet hardly seeming to press the grass, leaving no footprints as he passed; but in the waybread of the Elves he found all the sustenance that he needed, and he could sleep, if sleep it could be called by Men, resting his mind in the strange paths of elvish dreams, even as he walked open-eyed in the light of this world." (p 448)
