You will want to start by moving your furniture to accommodate the size of your blanket(s) and picking a floor plan that will hold up agains't intruders. In this example I use a couch as the back wall and a tall lamp as the center piece. You may adjust the layout according to your room of course. Also, if you need to hook blankets together to maximize the coverage simply use clothes pins or safety pins. Duct tape will also work if it is readily available and you have the right type of blankets. Quilts usually work best to deter light and enemies, they are thick and sturdy.