Crossing a chasm

I find myself up high, looking over a vista of canyons in the distance with valleys below. I need to get across a chasm and the only way across is a narrow arched metallic bridge with no railings. Walking it as a tightrope walker might is out of the question for me since heights and vistas affect my balance making me very unsteady on my feet. So I start across on my butt straddling the narrow span inching my way along over the deep canyon on my rear end. The dream ends before I get all the way across. When I woke up I thought, "Why didn't I just fly?"