While it might be tempting to roll out of bed, attend your first class in your pajamas, then take a three-hour lunch break, it will actually help you to have a schedule. If you have lectures or quizzes that you need to attend at a certain time, add those to your calendar first. Then, figure out how much studying/writing/research time you need and set aside time to do that throughout the day. Give yourself plenty of breaks to stretch, go for a walk, and, yes, watch a little TV, and then get back to it. Try to have set start and stop times in your day as well, so you can give yourself a break and time to recharge at the end of the night, knowing you will be back at it in the morning.