When I took Ambien, I only had problems if I drank alcohol earlier in the night or something unnaturally kept me extra awake when I was trying to sleep after taking it. But I was never weird and dark and moody. Usually, I was just more uninhibited and goofy, and had hallucinations. I would get online and blearily and cheerfully chirp at my friends on plurk about the Hatman and other weird stuff I was seeing because I thought it was so novel and wanted to share. Then they'd yell at me to go to bed.

The few times it happened, my friends and I just laughed about it afterwards because I mostly just acted silly and they thought the way I described the hallucinations was funny.

I think the Ambien is probably just a cover, but even if Ambien was playing a part I think someone's personality often plays a part in how they react when impaired. If her response to becoming more uninhibited is to be petty and say the quiet parts out loud, I'll just say that's not a universal response to being in that state. I was never mean, I just had a burning desire to share with my friends how my desktop background was now moving and how cool it looked.