This works on 1.31 german edition
I downloaded the v1.31 german firmware for the Story HD Wifi version. Installed in on a Story HD basic (without Wifi). That worked. Then I installed this very nice patch. That worked. I now can add my own sleep art.
So I gues this also works on a v1.29 US version.
Thank you for this nice patch. (by the way, I'm from The Netherlands)