We found that the best way to darken the bedroom area in our MH was to close the blinds with the slats in the reverse mode, then use clip on clothes pins to hang a heavy bath towel from each window valence and cover the roof vent with a piece of foam board covered with decorative cloth (secured with velcro). Worked great and we were able to get our normal 7-8 hours. It was very evident to us that with all the daylight throughout the evening that we weren't going to get the normal ques from mother nature that trigger sleepiness. Because of that, it was tempting to stay up late and get just a few hours rest but both the wife and I cannot function well without a good nights sleep. This worked well in 2009 and 2010 and hopefully will again this year. We leave Illinois June 7th. Mike