Elves don’t need to sleep. Instead, they meditate deeply, remaining semiconscious, for 4 hours a day. (The Common word for such meditation is "trance.") While meditating, you can dream after a fashion; such dreams are actually mental exercises that have become reflexive through years of practice. After resting in this way, you gain the same benefit that a human does from 8 hours of sleep.
Can a Trancing elf move, such as by slowly walking in circles (pacing), without interrupting the Trance?
(The specific reason I’m asking: I have an Elven Speedster character whose concept includes to be “always on the move, lest he dies”, a bit like a shark.)