Thread: On top of unstable stairs or structures...

This seems to be a very common dream sign for me though I've only been able to use it to trigger lucidity a couple of times. I'd find myself on a flight of stairs or on top of a structure well above the ground when the thing starts to go unstable and I'm about to fall. However, I somehow manage to pull myself together whether or not I'm lucid and have rarely awoken from such a dream though the experience itself could be pretty scary. Any idea if this is a fairly common dream sign? I'm also a little afraid of heights in real life..