The reason I don't know what's been going on is because...

The reason I don't know/remember what's been going on is because... ...it's because when you're dreaming, there's just no incentive for you to remember what exactly is taking place. You just hang out there in the dream environment, making no effort to remember anything, no effort at all to consider anything to be significant, and no effort to change the course of events. You just float around.