Easy Room Darkening Shades

[dkrug]

I have a lot of difficulty sleeping if there is much light coming in.
Living in the country it isn't a problem, but when we travel we end up in some places with a ton of light pollution. I like the curtains in the trailer, but they don't do a thing for blocking light.
I bought some thermopane panels at a KMart, cut them to fit behind the curtains, hemmed the edges and used velcro fasteners to attach to the curtains. Quick, easy and inexpensive. The picture shows half of one side done.