I wouldn’t call myself a workaholic at all. Work can be stressful even if challenging. But if I had a billion dollars and didn’t have to work at all I’d still do the exact same things I do today.
I don’t think that’s really a problem. Does a surgeon not read technical articles on her free time? Does an NBA player not work on his game in the off-season? All of that is unpaid labor, but they just really want to get better at what they do because they feel good getting better.
If you feel that’s stressful then just check if you’re doing it for the right reasons. Personally I do it because I like it, not because it’ll pay off career-wise in the future. It never crossed my mind that one day I’d get paid more because of all the things I learned years ago: I just learned them at the time because I wanted to.