Where do we go?

I am sure there are some of you out there that have experienced this. You are driving along and at some point you kind of zone out. The next thing you know is that you have driven for a long way without realizing it and can't even remember the dive or making the turns. Almost like you "blacked out". This happened to me the other day and as I "awoke" from my zone I almost felt drugged and kept that feeling for the rest of my drive.