I just finished all of my coursework for my PhD program, and am entering the research phase of my degree with a topic already in mind.  I've already started the research, but I'm already finding that I end up procrastinating a lot of my time away.  When I was taking courses, I felt like i didn't have time to procrastinate because of the pace of the classes and I felt like I had to always keep up with the pace.  But now that I have no specific constraints, I feel like its harder to pace myself.  

Of course, I know it's a bad habit to procrastinate and I should probably devote most of my waking hours to my research.  Sometimes, (especially when I get stuck) I find it's so easy to get distracted on the computer (websites, youtube, text messages, etc.).  

What are some effective strategies to avoid procrastination during this research phase?  How do you stay on task, especially when you get stuck?