Just as the title says, I have two new babies that are about four weeks old. One is always up exploring and doing his thang, the other one is awake for maybe an hour or two a day. When he is actually awake, he doesn't seem interested in playing or climbing and just seems unenthusiastic in general, though he's still eating and drinking. Last night, I decided to wake him up and take him out of the cage to see if I could get him moving and after maybe a minute of curiosity, he just fell asleep on me. I've only been a rat owner for five months so I'm still pretty new to their behavior, has anyone else experienced this with their babies?