I forgot to add my personal observations of what the morning glory experience is like. Aside from the fact that the seeds taste like crap, the first hour and a half is spent (as KrZ stated) with agonizing nausea. I've tried them on three occasions (~250 seeds) and each time it took a supreme act of willpower to stop from throwing up. After this passed, other undesirable physical side effects set in. I experienced cramping, blurred vision, and the feeling that I was being pricked with pins and needles every time I stretched my muscles. I also came down with bad diarrhea. After my last attempt with these seeds I went to sleep and shit my pants all night while sleeping. I went through every pair of boxers in my drawer and thank god I was on my last pair by the time it had stopped.
However, the experience is not entirely bad. There are benefits to the state of mind brought about by morning glory intoxication, similar in many ways to LSD, but IMO the negative physical side effects outweigh the psychological benefits. I understand that extracting the alkaloids in the seeds with petroleum ether and ethanol will yield an extract that eliminates these unwanted symptons. Anyway, I've already satisfied my curiosity with these seeds and have no plans to try them again.