Doxylamine
"I have been using this drug (known in Australia as Restavit). 

I can only use half a tablet because it is so strong.

Last night my girlfriend used it with disastrous consequences. 

She slept walked and talked the entire night. 

Several times she apparently awoke only to begin babbling back in her dream state. 

She was constantly getting up and walking around, turning on lights. 

She was crying uncontrollably at times for half an hour at a time. 

This morning she has no recollection of any of it. I will keep using it. She will not."