Our local astronomy club just gave out red celophane plastic bags. You could probably use a sheet of that (which looks to be about $15 for a package that you co

Our local astronomy club just gave out red celophane plastic bags. You could probably use a sheet of that (which looks to be about $15 for a package that you could cut yourself?), and keep it on your nightstand. I know it's neither as convenient nor as easy to use as a case mod or f.lux, but it's worth a shot.