Our four boys have a huge cage. A double critter nation with lots of toys, hammocks, beds, etc... They also have an entire room filled with things to climb and play with. I let them out of the cage for at least an hour every morning and then for several hours at night. (probably 3-4) They don't seem all that active. Inside their cage it's 99% sleeping. Buddy is the only one of the 4 that runs on the wheel. Outside they do play a bit, but a lot of times they'll just go under one of the blankets or into a dark corner and sleep or sit on my lap and let me pet them. I've watched some videos and it looks like other people's rats are much more active. Are all boys just lazy? Or should I be worried about them?