My beardie, Chief, is around two years old but I have only owned him since Christmas this year, which means that I've had him for about two months. He doesn't play very often, unless he is outside of his tank, and even then the play only lasts for about five to ten minutes. Then he finds a dark corner and sleeps in it. He also always has some stripes darkened on his beard, it is never completely light. He has been this way since I got him, and his previous owners said that he was a bit on the grumpy side but I'm not sure if this is just his natural temperament. We didn't have a UVB bulb for the first few weeks, so we thought that that might be the problem. However, even now with the bulb at a distance where he gets adequate UVB rays he still behaves this way. He eats plenty, his tank gets up to about 105 degrees Fahrenheit in his basking spot, he gets 10-12 hours of night, and he is in the middle of a shed right now. I know that sheds can cause some irritation, but he was like this before his shed as well. Is there something wrong with him, or could this just be his natural temperment?