A friend is grappling with window treatments in her bedroom. She needs the light completely blocked because she is light-sensitive and cannot sleep well with light coming in. She doesn't want blinds. I usually would recommend draperies lined with black-out lining to do the trick, but her windows are similar to the wall of 3 windows in this pic (Note: this is not her bedroom, it is a pic I copied from a website). Any suggestions would be appreciated.