I beg to differ with your assertions that she was not talking to someone in that video. When she is to the left of the elavator from the inside looking out, and facing the right. Her hand gestures CLEARLY indicate, at least to me, that she is trying to communicate something to someone.
The hands flat facing the ground spreading out away from each other....the wave like motions she makes with her hands just after that.....those aren't just random hand gestures made for no reason, and they aren't dance moves either.
I question how lucid she may have been at the time, and perhaps her slight break from reality contributed to what she was trying to communicate, and what she was trying to communicate might have made sense to her, in a state under the influence of ambien, regardless if it made sense to the situation at hand. At least as far as she was concerned she was communicating a message to someone, whether there was in reality someone else standing there or not is a different issue.
We of course do not know if she had taken ambien. But she does appear to me like it is certainly a possibility.
If this video was taken at 2am on the 1st of February, it would certainly account for why she would have wandered out of her room at that time, without an apparent purpose, and without her glasses.
I have taken ambien, and though never slept walk, have had entire conversation with people just 20 minutes after taking one that I have no recollection of. I have personally seen friends who have slept walked on ambien, and been sort of normal but also not really making sense, like waking up in the middle of the night to make a tuna fish sandwich, and then telling me they HAD to make a tuna fish sandwich because they couldn't go to class hungry, and there mom would be mad at them for not eating one right now. No joke. Ambien does weird stuff to people's states of mind.
Here are a couple articles and links that discuss crazy ambien sleep walking stories;
http://www.naturalnews.com/019413_Ambien_drug_side_effects.html
http://www.washingtonpost.com/wp-dyn/content/article/2006/03/13/AR2006031301317.html
http://www.medicalnewstoday.com/opinions/8670/