I have taken ambien for about 6mos not on a regular just on weeke...

I have taken ambien for about 6mos not on a regular just on weekend, when i can devote the time to sleep...and feel tired in the moring...but when i take it i get sexual arouse and if my wife tells it...can get a little rough sexually..she likes it when it take it..but i don't remeber what happen the next day..but later on it comes to me....and she looks satisfied when i look puzzled...is this a common side effect and if so can i remeber it the next day or same night...