The best thing to do is keep them off the bed, but if you want to allow them on the bed during the day, he should take his pillow and put it in a closet or somewhere else while he's not using it, and make sure to wash the pillowcases at least once a week. That will keep the pillow from accumulating a lot of cat dander, so his eyes don't bother him when he gets up in the morning, and he won;t be breathing in cat dander when he's asleep. . Another thing he can do is to be consistent about washing his hands after any play time, so he doesn't get cat dander near his face. There measures, and getting kittens used to baths, should do the trick, but make sure he monitors the situation carefully. If that doesn't do it, you may end up needing to ban them from the bedroom, but that depends on what your living situation is like how feasible that is.