a pampered, petted house cat. nothing to do all day but lie in the sun, eat, nap, and play....
When you notice that you are starting to feel that way... try to go for a walk or do something that takes your mind off of what it is that you are thinking about at that time. Just clearing your head...
It might just be something emotional that you are going through, but try maybe to do something different, maybe you need a change....