Don’t feel bad about not wanting to replace your relaxation time with more work. You enjoy thinking about this idea because thinking is an escape; a distraction from whatever you’re doing in that moment. Actually doing it is not an escape any more, it’s a new problem. Maybe you could test it out without writing any code? Or maybe not - maybe you just need to find a new job or something like that. Or maybe there’s nothing wrong with the occasional daydream?