Dream:

I encounter a flying car, shown off by its designer, a recent design. It is meant to respond to thoughts... you just think of the direction you want it to go and it does. So anyone can fly it, doesn't need a trained pilot. I climb in the car and take off and head steeply upward and forward. I am concerned about hitting trees and power lines so I am careful. I go up the side of a mountain. Then I am not in the car any more, but standing on a long board. It's still flying, but lurching and barely under control. I come to a beautiful green field with kids there, near the top of the mountain, and land the board.

Then I seem to go over this in my mind, and I become aware it's not really a flying car, but rather a device that you use while you sleep to make you feel like you are flying in your dreams. The dream has lots of technical detail about how the device interfaces with your brain to make you feel like you are flying. I think, "Wait a minute, this is not a way to fly at all. It's all imaginary. And I'm fully awake now, so I must have been dreaming about flying."

Later in the night when I woke up I was startled to realize that I wasn't already awake -- I felt so sure in my dream that I was awake!