insomnia
"I was admitted to a hospital cardiac care unit following an MI.  I received Ambien and woke up from sleep profoundly confused and hostile.  I ripped out of my arms and legs all the IV and EKG leads, and then left my bed, marching to the double doors of the CCU.  Female nurses were screaming, for I was naked and bloody from the leads being torn away from my body.

The bravest man I ever met was a young CNA who stepped in front of me, telling me "You cannot leave the CCU."  Considerably shorter and lighter than me, his action was totally courageous, given that I was in a temporary, drug-induced altered mental state.  I recall only vaguely warning him that I would throw him against the wall if he blocked me.  I awakened, embarrassed, ashamed."