Mine has taken the fall as well once. I'm pretty sure I heard the wind get knocked out of her. They are not the brightest and she was trying to stand on the tip of her tail... Unfortunately my tank is that tall. I didn't do enough research on them.
I spent 150 on the tank and the stand and quite frankly I don't plan on switch to something else due to that... perhaps if I'm sitting better cash wise in after the summer.
The point of my post was actually just to show a pic of Kali pretending to be a tree snake.
At night she as well goes up the wall but it's nothing close to this anymore.