Stew, I fish at night and use jigs and minnows. I use minnows under bobbers and jigs vertical fishing. When I do use a jig under bobber I "work it" like others said to draw the attention of the crappie. Sometimes they will hit a motionless jig but usually some type of small movement is needed to draw the attention of the crappie to bite. This is where you can't relax as much.
When I set my poles on my trolling rig and am fishing still I "rock" the boat a bit here and there and entice a bite. Other times they just hit my jig when I think I am sitting absolutely still but the waves may move the boat up and down very slightly drawing a bite. I think it requires at least "some" movement to make the jig work for you. Hope this helps.