If you think 3 kids is rough...
try finding a family room for 5 kids!
I was the 5th kid in my family, and more than a few times I got a sleeping bag on the floor, as did a brother. My mother always tried to book the largest room available, but even so sometimes there wasn't enough beds. Of course, this was back in the dinosaur era, where hotel managers would ignore the sleeping bags for $10 to $20 under the counter.