[chanz]

In my case, it helps to stick to habits. Habits that are device, cloths and location specific.

The biggest one is probably my computer at home. It only exists for gaming. When I'm inside my gaming room to enjoy a gaming session, nothing else gets close to me and I forget about everything as soon I step into this room.

Another thing is, that I have cloths to relax, to go out and to go to work. As soon I change into my plain white shirt with collar, my brain probably switches to work mode.

The third is similar to the first habit. Going to work and being there is also a 'swtich' and I can concentrate.

I was a freelancer too and I had a hard time to work at home. My computer was always just a room away and just going in there for a 'short' gaming session was too easy.

So basically this is my advice: Go and buy a different computer than the one for gaming, shower in the morning and change into your business attire. Leave the house and go somewhere boring and quiet. The last part is the hardest since everything gets interesting depending on how much you have to overcome your habit. Your brain tries to fill your enjoyable habits with new enjoyable habits, instead of the 'boring' work. This is probably why so many smoke - it creates a enjoyable habit of doing 'nothing', which is better than working.

I hope this helps a bit. :-)