Because this doesn't happen very often.
It's been fourteen months since you leapt--where were you at that time?--from bed to floor or chair to floor to stairs, from the second floor to the first floor to get some water because you couldn't breathe. I could imagine you rushing down, skipping steps and bounding up again after you drank. Maybe in your mad dash you missed a step or hesitated before a foot landed on something solid. I don't know, I imagine things.
