|This article is about an older version of DF.|
Unconscious is the state wherein a dwarf is unable to move or do anything of their own accord. It's noted under the basic wounds screen (iew creature -> ounds.
Dwarves can become unconscious for a variety of reasons. The most common, of course, is that they're sleeping. However, a sufficiently-injured dwarf can, and will, faint and become unconscious. Should such an injured dwarf make it into the healthcare system, they'll remain unconscious with the Rest job until they're treated.
Anything that falls unconscious can be caught in a trap, including creatures normally immune to them. This includes Dwarves, who might decide to take their last nap ever on a tile with 10 Giant Axe Blades.