Time event symptoms and conditions

I have MS and have been taking Ambien for a few months now to help me sleep. My husband and daughter told me this morning that last night I got up from bed and was completely naked and walked out into the living room. They said I looked very wasted and was looking all around the house for some soda and them went back to bed. I can't remember any of this. It scares me. what if they were not home, would I of drove to the store naked looking for soda? This is a very dangerous side effect. It only happened one othere time when I got up and was surfing the TV channels looking for a TV program. Again, I don't remeber it happening. I also It is making my MS symptoms worse, I am having more stiffness and spasms along with blurred vision.