Push the bed all the way against a wall so that one entire side of the bed is touching the wall. This will allow the wall act as the back of the "sofa" during the day.
Attach several self-adhesive Velcro strips along the wall behind the bed about 5 inches from the top of the bed.
Sew the pairs to the Velcro strips on the wall to the back of several medium-size to large pillows.
Match the velcro strips from each pillow to one on the wall so that the pillows line the back of the bed, acting as a sofa back.
Place a thick throw over the top of the bed so that it covers the sheets on the bed and acts as a sitting surface that can easily be removed.
Place a small decorative hamper or basket next to the bed. Place a comforter and head pillows in the basket. When you are ready to convert your daybed back into a twin bed, simply remove the throw and pillows from the wall and place the comforter and head pillows on the bed.