I should preface this with: I'm not an artist.
For my full-time job; I own and run a small business in the heart of the city, with all the huge overheads that come with it. Today I started at 8am and left at 8pm. With 2-3 hour travel all up, it's a long day. Then I come home and finish up any work I didn't get a chance to do. I usually eat at my desk, with my work in front of me, and trying to maintain a relationship through the walls.
And then, at about 11pm, I start the comic stuff.
I'm the writer (of quite a few comics), graphic designer, brand builder, marketer, social media manager, and website(s) monkey. I sketch things and do some of the layouts on a few of our projects. I spend time animating panels and because I'm an insane perfectionist, I spend hours trying to make them as seamless and natural as possible.
Most nights I get about an hour to do some things and then I'll try to do smaller things throughout the day if I get the time. I don't have kids yet (a choice we made because, as you'd know, priorities change drastically when that happens and we're not ready to be that selfless) but I do have 4 dogs, 1 cat, and 2 guinea pigs... so there's still a lot of poop and vomit to clean. It can be so mentally and physically draining sometimes.
I think it all comes with the territory. That passion and drive, to not just succeed but to form something with your own brain and hands and ultimately breathe life into it.
You are definitely not nuts. You are a creative.
At the same time, always be kind to yourself. If you notice things are getting overwhelming, take a step back for a while. Much better to take a break than to burn out. 