Well, I happen to work in a bathroom with no windows to worry about. However, what I did for my door may be effective for your situation. I ended up using a spring tension shower rod to hang a blackout drape over the door. I think I paid about $20 total, $10 for each item. Then for a few more dollars, I got an inch diameter dowel that I cut to size and slipped into the bottom loop of the drape. It's cut so that the drap overlaps the entire door, but the part with the dowel can be wedged snugly into the frame. This keeps the drape nice and taut over the door, and ensures that the overlap doesn't go anywhere. It also pins the bottom to the floor to prevent a leak from under the door. I then picked up a roll of velcro and lined the frame where the door presses against it with the soft side of the velcro. It's easy enough to roll the drape up and secure it above the door when not in use.
You could just as easily run a lap of velcro around your window. Line an equal lap on a black out drape, and "stick" the drape to the wall over the window when you need to. Attaching a couple of dowels to wedge the drape into the window frame would help to create another corner for light to have to bend around.
Note: Those shower rods can be made much much shorter with a pipe cutter and a hack saw. Just cut equal lengths from the outside end of the inner rod, and the inside end of the outer rod. Then saw off any extra spring that protrudes when the rod is collapsed. A bit of gaffer tape is good for covering the edges to keep them from chewing holes in the drape...or a file if you've the patience.
Last edited by Tempest09; 03-02-2012 at 02:45 PM. Click to view previous post history.