I feel like this, too, and lately it's been creeping up more and more. My kids are 5.5 and almost 4, so my younger one will be in K full time Sept of next year. I would like to work part time when that happens, but even now, there are many days where I am so irritable with the kids that I feel everyone would be better off if I went to work and found someone to look after them who was patient, and who would actually have fun playing with them. So many days I do the basics - meals, cleaning up, bringing them to school or now that it's summer some sort of activity, but when we're at home, the last thing I want to do is read to them or 'play'.
I feel like I need some mental stimulation, and regular interaction with other adults. I feel like I would be a better role model especially for my DD if I had a career that I found meaningful. I worked PT when DD was 1, but didn't go back to work after DS, so I've been SAH full time for 3 years.
Money isn't really much of an issue, as DH makes enough that I don't 'need' to work, but it would be a nice bonus. It's more that I need to use my brain in a way that I feel like I'm of benefit to society. I'm already on the board of our preschool, so that's something (using my brain), and I feel like I'm enjoying those tasks more than parenting a lot of the time. I need to figure out what type of job I would want to do, but that's a whole other story - I think I've hijacked enough!
Mama to my two sweet monkeys - DD '04 and DS '06