I've been having them since I was really young. I remember one I had when I was probably only about 6 or 7 that there was a volcano across the street from my house that was about to erupt and there were dinosaurs everywhere. It sounds so silly now but it was pretty traumatic as a kid.

Yes! Mine often involve water like giant waves or whirlpools sucking people under the water and/or large explosions in the sky with huge smoke plumes. They usually make me feel super anxious for a good couple of hours after I wake up