I can't believe that it hadn't crossed my mind to do that. That's exactly what I need to do for now. Thanks!
In the long-term, it would be great to image during that time too. My exposures are generally in the 3-5 minute range so that's 7-10 images once settling, image download and the rest is factored in. For now it isn't a huge deal because I get the feeling that the local light pollution decreases in the time period (9:30-10:30pm CST) that I'm recording PEC this time of year.