Hi I have had my 2 boy rats almost a year now, they have very different personalities but recently I've noticed something strange. When I let my boys have a run around in the evening the most sociable one, Pinky will eventually lie down, get comfy and sleep. But my other boy will just sit at the top of my bed with his head pressed against the wooden frame, he just dosnt seem to relax and get comfortable? Is this normal and is there anything I can do to help him feel relaxed out of the cage? He's reluctant to come out too.