If the OP is struggling with the stress of his current role I fail to see how adding additional work is going to help.
If by tech you mean "along the same lines of what I'm doing at work" then you're gonna have a rough time. I do hope that your mind has the ability to wander a bit further from the train of thought you have you typically have while doing what you're paid for.
This goes for the other two replies above as well. If you have an original idea then you're safe. The hard part is having an original idea or even an idea that is several steps removed from a previous idea but still useful.
Either decide to go all out or don't do it all. The stress of trying to juggle a full time job and a starting a business and being there for your family isn't worth it.
Back to reality after running out of savings and after freaking out, I took a huge slap in the face interviewing for 30 companies... trying to get the same job I hated before, having to go through all the painful and stressful interviews while seing my bank account getting closer to $0. At the end of the day I took a huge pay cut, I’m no longer working for a top tech company and I feel like I took 5 steps backwards in my 9-5 career. There are hundreds of young candidates out there who have the same skills, same background etc. And they all want your job. I don’t have any savings and I’m back at a crapy job at an average tech company. That sucks, but at least I still know I will ot retire from a 9-5 job in 20 years from now. I will try over and over until I’m able to generate a sufficent income from my own business. I had to go through this experience in order for me to learn something. Today I know exactly what to do next. Just need to recover from that free fall.