I'm a kind of restless guy sometimes. I fidget. I don't sit still at my desk all day - I'm up and down all the time, walking here and there to do some thinking. So if I need to sit down and focus on something, it's tough. A trick I've discovered recently is to take my shoes off. Because I don't want to walk around the office in bare feet, this increases the cost of leaving my desk and makes sure that I have a very good reason if I have to leave. This wouldn't work if I didn't care about going barefoot. Or if I had some slip-on sandals in easy reach.
Mokalus of Borg
PS - Wearing slippers around the office might not be a great career move.
PPS - But I guess you never know until you try.