Yeah that would be curious to investigate for sure!

I can only speak to my own experiences, but while I have observed the phenomenon you describe in preparation for travel/while travelling, Chloroquine dreams were waaaaay more dramatic than anything I've experienced with other travel. I forget what the exact timeline was, but I think I started taking them about a month before departing, and the dreams started about two weeks before departing, and stayed pretty much constant until a few weeks after I'd been home and stopped taking the pills.