In no particular order and YMMV. I'll add more as I think of them. As people have mentioned, it can creep up on you and if you are worried about it you might a

In no particular order and YMMV. I'll add more as I think of them. As people have mentioned, it can creep up on you and if you are worried about it you might already been burning... * struggling making time for your hobbies/friends/non-work activities * scared of your inbox * sleeping longer * Eating more (comfort eating), or eating less * Exercising more and being harder on your body or exercising less frequently and struggling to find energy when you do exercise * Taking more drugs, drinking more alcohol * Being short with those who are close to you (snapping) * Losing your desire for a long and happy life