Did read online about astronauts who are in space months at a time and away from friends and family, keep structured schedules with specific times of when to do certain tasks. This would be helpful for me since I have set daily goals, but for some of the day may drift or idly watch tv or stay on the internet. In the next few days may try to set myself a schedule of tasks for the day to include things such as study 11-12:30. Lunch 12:30-1:30, nap 1:30-2 pm, etc.