e-reader/book bed holder

For those that don't have a place to put their book down after reading in bed. Especially if there is a lamp or a cup of water on your nightstand. This handy dandy holder slides in underneath the mattress and voilà it's installed. Can comfortably hold a book/e-reader of dimensions up to 180 x 150 x 40 (mm) or 7 x 5.9 x 1.5 (inches).