I fall short on the amount of sensory stimulation I need to do with each of them, and am brainstorming ways to accomplish more (like having the dog help oversee patterns). The challenge is that sensory stimulation can't be done at once, it must be done throughout the day, or at least with blocks of time between each "session."
I found the book, What To Do About Your Brain Injured Child, quite helpful in understanding the methodology behind the various activities.
