When I knew people wouldn't be bugging me, I would be generating work, but once there even was the possibility of people coming by I wasn't able to work as well. When I had time to hit a stride then I could keep working until someone actually came up and asked for something. Sometimes it meant coming in a 6 in the morning, but at 9-10am when everyone else got there, work started sputtering. But that was just my experience at one company.

To help ensure privacy with no distractions while trying for that alpha state I found that music helps. Antisocial behaviour can get certain people to avoid you, but it tends to show up in reviews.