Same idea as a T-Shirt quilt. If you are a beginning quilter, this can be a challenge. It is stretchy, so you need to deal with that. With a T-shirt, you put fusible behind the piece you want, fuse and then cut it out. Because this is a smaller item and is irregular in shape, it might be an easier option to attach it to a background piece, stitch it down (think applique) and then maybe do some decorative echo stitching on the background. Once you have enough blocks made, I would sash them in a coordinating color and use that same color in a border. This would pull them all together and make the sleepers be the stars. Also, doing it as one block at a time is a lot easier on a beginner, you get to feel a sense of accomplishment with each completed block!