PJ's

Ever tried to snap your screaming, squirming child into pj's? When Connor was littler (read immobile) it wasn't difficult to get him into his pj's at night, but things have changed. He is constantly trying to sit up, roll over, grab at the lotion, or pretty much squirm any which way he can manage. Putting on pj's has become a tremendous chore. It's amazing how long it takes to align 13-15 and successfully connect each (yes, I count them each time).  Why can't I find more jammies with zippers? Why is it that zippers are non-existent until size 2T?