Hi,
I now only "drift" during severe anxiety episodes, but I know what it feels like and it can be comforting if you are in a "safe place" and scary if your driving on the road. To me,It feels like I am floating with little control over my actions. I think it's kinda hard to remember things when you drift for me anyway because I started drifting at a very early age and I can remember floating above my body when I was being abused and watching it from above. I try not to let myself drift because it scares me. However I can feel a drift coming on becuase my eyes become fixated on an object and I start to stare before drifting.
I hope this helps.