Sleepwalkers symptoms and conditions

I was an occasional user of Ambien CR, took it if I couldn't sleep. Well a few weeks ago I couldn't sleep took an Ambien and woke up in bed the next morning with a crushed wrist, cheekbone, temporal bone, bruises etc. Apparently, I walked in my sleep had a serious fall (and concussion) then got myself back in bed???? I don't remember anything--including much of the next day, emergency room, operations etc. It was a nightmare. I seriously think this drug should be taken off the market. It made me wonder if I walked in my sleep after taking this before and had no recollection.
I have missed weeks of work, gone through several extensive operations and have been through a lot of pain. I have since read that I am one of many ambien sleepwalkers with all kinds of results---why are they still allowing this drug to be on the market????