At my previous job the anti-competitive clause was strong enough to include anything which uses the same skillset as your day job, even if it's a non-commercial side project. I originally thought it was fine, since I hadn't managed to find time and motivation to work on my dream project, anyway over the previous four years.
Five years in, however, I had an epiphany which meant I just couldn't ignore the urge to work on it and finally see it through. I ended up changing jobs largely to be allowed to work on it.
It's been difficult, finding time and motivation, especially since I will always prioritize spending time with my kids above any other activity. But I've managed to find time a bit, mainly in the evenings if I happen to have energy over.