I program rarely in my daily job and my work is not so demanding (though in the last few weeks I've been designing a fully automated machine), yet when I arrive home (I hardly work more than 8 hours a day) mostly I'm only capable to read news portals. My Lego hobby suffered from this (I'm quitting that), though I found that much more demanding than hobby programming.
Since the last few months, we are looking for a house (however it's expressed in English...) with my wife, but we don't have kids yet. I can only imagine that I have to quit pretty much all hobbies for a while if we'll have kids.
Nowadays only I do some javascript and webdesign things as hobby. That's brainfuck, much more random and backstabbing than any other programming I did, so much for a relaxing hobby... Still more manageable than designing Lego models.
I have an idea for a long term but slow pace hobby programming: simple rookie javascript games and to make a website with a bunch of those. I'd port some of the games I already have (like the Kraken game, a tank wars clone), and maybe can invent some new ones. I'll try to do my best to produce self commenting code. Or whatever.