Y.H.
Hi,
Do you have any computer skills or word processing? Maybe you could look into being a VA - Virtual Assistant. There are small businesses looking to outsource to people, or maybe even typing college papers or resumes. You could do this a few hours a day while your son is sleeping. Here is just one site you could look at: http://www.mommysplace.net/become_a_virtual_assistant.html
Hope this gives you some ideas.
I prepare taxes and resumes at home. I started doing taxes while I was pregnant with my youngest child. It is good income especially during the season. I also work part time out of the house, but to make extra money I enjoy these two things.