Is there any good theory/explanation for what exactly aliens do to control our minds and memories?

Is it a technology they are using or their own psychic powers? Both, just depending on the alien species? A guy (remote viewing expert) on the Jesse Michaels podcast recently said that in the 60's aliens attempted to abduct him, 2 huge workers and a grey alien that tried to make him fall asleep multiple times but he was able to resist it. So it seems like we can learn how to defend against it. I'd like to really understand what's going on though. People have their memories recovered with hypn...