I have noticed it with zombie pig-men and chickens so far, but when they are navigating around my cave they try to jump up to the block where my bed is, but since the bed makes the jump over a full block, the mobs can't make the jump of course, but the AI seems to think that it is a possible jump height and just jumps up and down in one spot over and over. The mobs don't appear to stop jumping and if I push them they move back to their spot unless I constantly push them away from the bed and they eventually fix themselves. The layout and bed is shown in the screenshot below.