I've gotten my hands on melatonin now, inspired by your comment. I've found a site that actually shipped it from Poland, which I believe isn't even illegal and definitely won't get me into trouble. The cost is still minimal. So far, it seems to help. Thanks again.
If you want to explore the community more, I recommend reading the Library, checking recent Curated posts, seeing if there are any meetups in your area, and checking out the Getting Started section of the LessWrong FAQ.
The Open Thread sequence is here.