Set a schedule
Every day, at nine, wake up and study a subject, math or science for example.
Do this for an hour, then move on to another subject to study for an hour.
Take a walk when your done, and get outside, come back, and force yourself to read for an hour, a book, any book.
You've now studied for two hours, gotten an hour of exercise, and are reading around two books a month.
Thats four productive hours a day, and it makes it easier to do something with the other 20 hours, believe it or not.
Worked wonders for me.