Rest

From DwarfFortressWiki

The Rest job is activated when a dwarf cannot do most normal tasks. (Like walking around) The dwarf with the rest job is either rescued and put in a bed, or moves very slowly to the bed leaving a very annoying trail of blood. In most cases the dwarf will stay in the bed until the injuries are fully healed. Notable exception is the situation, when bed is located aboveground, dwarf is capable of walking (has both legs uninjured) and dwarves stay indoors order is issued.

More information at Wound