insomnia
"I have been taking Ambien for more years than I can count due to insomnia and nightmares.  I have experienced the "sleep walking" activities, mostly repetitive conversations and eating which have been benign and harmless.  Fortunately, I have family that is up later than me so they keep me from doing anything too outrageous.  Sometimes I have a vague memory of my activities if my husband brings it to my attention, but if I am particularly stressed or anxious the side effects are amplified and my memory is gone.  As for morning grogginess, a shower usually perks me up."