His hobby is programming. He spends all his spare moments researching and coding. I feel like solving computer problems is the only thing that truly excites him in life and he doesn't seem to be as excited about the time we spend together as a family or couple.
I suppose the actual hobby is relevant, you could substitute in any pastime really - video gaming, tinkering, Facebooking, whatever. Although it does seem relevant to me that it's a screen-based hobby, they seem to be so all-consuming compared to other things like DIY or crafts, and so accessible as you can easily fire it up any time, anywhere that you can bring a laptop with you.
DH things I'm trying to control his hobbies in a weird way instead of just leaving him to it. I don't know exactly why it bugs me so much but I think it's partly jealousy that he has such an intense interest in it, an interest I would rather him take in us as his family instead, or even just something a bit more tangible that we can all see. If he did the same hobby but otherwise seemed balanced I wouldn't mind so much.
I don't know, maybe it's me that just needs to be a bit more understanding - I don't have anything I'm that obsessed with so maybe I just can't empathise.