After I read about the falling down into nothing experience, I remembered, when I was a kid, I'd have this dream when I had to pee.. So as I grew older it became a cue to get up and go to the bathroom.
I can also wake myself up when a dream gets too spooky, so I kinda never have nightmares.
And yes, I believe I had dreams which happened later in my life. Or just flashbacks as if I experienced the same thing before. Once I was lying on the floor in the living room, in our previous house. And suddenly I remember me lying there exactly the same way, looking the same way, but there used to be a fish bowl..
Just recently I was sitting with a friend, I only met her recently, and when I was in her living room, I suddenly felt like I'd been there before.
I had that kind of stuff happen before a few times, kinda weird. But I remember reading something about it, about your brain tricking you into believing you already did something, but it's not true.