My grandmother has this really steep staircase that leads to her basement. I broke my tailbone on it once as a kid because I thought it would be safer to sit-scoot down it than walk down it. Anyway, her house is also something of a
Winchester House phenomenon, and she's always replacing stairways and walkways with steep ramps and stuff (there is a stairway that leads to nowhere, just like the picture in that link).
So I think that's where last night's dream came from.
I was supposed to go to her basement to get something, which I don't like doing anyway because I stay away from the stairs. I opened the door and immediately lost my balance and had to grab the doorframe to steady myself (I'm told I made a yelping noise in my sleep). I looked down and the staircase had been replaced with a ridiculously steep ramp, steeper than most playground slides. The entire nightmare consisted of being slightly off-balance and trying to keep from falling down this ramp.
I must really have some psychological thing with stairs, ramps and balance because lately they've made up a good 80% of my nightmares.