When past sins become boring

Sometimes I just get so caught up in the moment - so caught up in feeling good, that doing the right thing takes a backseat. Why is that? My faith is still so weak. Because I've gotten too comfortable. This happens too often when I'm at home and "bored." I don't necessarily feel like sinning but do so anyways because I have the opportunity and am usually not worrying about things like "when am I going to write that paper?" So is the cure to be constantly doing something Christ-like?