Room Darkening Window Shades

The house my mom has 2 windows side by side that are 39 "wide each. It has room darkening curtains strong, but they are hard to get and maintain. She needs her dark room to sleep. Are there blinds or shades really good that do a good job? Our apartment complex can not put aluminum foil and the windows (which I'm really happy about!) Any ideas if please? Thank you!

Not sure if you could put up a window cling that kind of thing, but if so, I suggest using the window film privacy. Link below. I've used it and its super easy not to do alone, but it is feasible and even easier with a friend.