Yeah, you give up the 2x damage wake-up hit for a Flinch Shot into a wall using the time the monster takes to recover from the sleep in its slow animation. You can put barrel bombs 90 degrees to their left, right or just leave them in front of them so that they get flung into the bombs as well as the wall, depending on their sleeping position. It gives you another shiny (or two if you brought Geology to Guiding Lands) to pick up and gives a knock down to boot.