Ouch....I always commiserate when I hear such things; I've had ONE cracked rib a couple of times, and it's agonizing trying to get a decent breath, let alone any sleep.
Two of the ribs broke in two places and one punctured a lung. A month or so later, we were watching the Miss America pageant. My sister, and her 20-something friends, were getting sloshed on wine and bashing the contestants (as any group of 20 and 30-something single ladies will do). Anyway, they had to make my sister stop her “ballet dance” (she had just enough as an 8 year old to have some sort of “form”) when I started laughing so hard my ribs began killing me.