You also have to learn to manage yourself. In my doctorate I HAD to wake up at 2am 7 days a week. So 5 hours of peace and quite pure focusing on studying. If I did not do this my ADD would kick in before I got much done. I learned once I left the house, my productive studying was done for the day.

Also, no music or tv on. If i could help it I would not turn on my laptop either.