An Elf will never sleep on the ground, for to do so is to invite death. Likewise, they will never wear white unless in mourning for a loved one, because that's the color of death.
Elves bury their dead in the earth, near the deceased's home. They have an elaborate ritual of mourning in which the one nearest the deceased stands vigil over the grave for a period of time that can range from days to years. Death is considered a very private matter, and only the family and (sometimes) closest friends are allowed to participate in the mourning rituals; the rest of the community ignores the proceedings, and will never again mention the name of the deceased.