I have taken Ambien for years, since the death of my father. My thoughts raced and I couldn't get to sleep. Even now I have racing thoughts if I don't take it before I go to bed. But I can sleep 12-15 hours or more. I'm sleepy when I wake up, have a snack, and go right back to sleep for hours, until I take my Concerta when I finally decide to stay up and get something done. Is excessive sleepiness a side effect of Ambien?