We're glad that you're enjoying Sleepy Time Jack! We've been working hard to increase our productivity with help from Project Ensō, and we're grateful that your support can make this happen.
Concerning your crashing issue, when does the crash occur? It's possible that the "crash" may actually be the Sleep Timer function going off. If that's the case, we'll ask BáiYù to add an option to turn it off completely in the next update.