sweet dreams?

Of the three dreams I remember from last night, in the first I got mugged, in the second my car’s cooling system failed suddenly after just having had the radiator topped off recently, and in the last…

I was alone, climbing a long sloping catwalk up to what was supposed to be the door of an airplane. The catwalk didn’t have any rails, so I had to basically crawl on my hands and feet, clutching the sides of the walking surface, to keep from falling off. When I reached the top, instead of an airplane, there was instead a door or hatch cut into the wall marked UPGRADE / DOWNGRADE. The catwalk detached suddenly from the wall just as I reached the top and it — and I — fell dozens of feet to the ground, incurring some pretty grievous injuries, I’m sure, if I hadn’t woken up.

What the hell is going on?