there's a land of restful sleep. we can help you go there on the wings of lunesta. ♪ i work hard for the money ♪ i work hard for the money ♪ so hard for it honey >> donna summer. >> all right. we all know what a problem the economy has been lately. some people are getting rather creative to make some extra money. >> indeed. that includes some moms out there who volunteer to be something of a guinea pig, getting paid to participate in medical trials. abc's andrea canning has met a few of them. >> reporter: every day jennifer martinez scans the internet searching for the newest clinical trials. >> we are currently assisting other callers.