Studies show that coloring books are very meditative and relaxing. I would suggest that if you get the smooth paper type that you get some markers, new paper type might be best with crayons. Also there has been some success in having things that they remember from their childhood to calm. I would imagine not being able to remember things is very frightening so kids coloring books with pictures from things in the past might be of benefit. Caregivers can certainly use some relaxation too so doing them together or alone might be just what the doctor ordered. Have fun.