Nightmare

I thought I was on a long highway, and I was driving on it.  And then it went up.  And then it turned into a rollercoaster.  And I thought I was driving on it, but I then was grabbing onto the rail with my whole body.  And this rollercoaster became an actual rollercoaster, where it was going real high and there were loops way ahead of me.  And I was somehow moving forward on this rollercoaster, but then I looked down and looked up and saw what the hell I had to go through in order to stay on this ... thing.  And I got scared that I won't be able to stay on, but I won't be able to move forward, either.

And then I woke up.