"Masturbation is just like procrastination, it's fun at first, but in the end you're just screwing yourself." I like that quote because it reminds me how useless both masturbation and procrastination are.
Spend 30 mins clearing your room, chuck dirty washing in the hamper, bin any rubbish, put coffee mugs in the dishwasher/kitchen to be washed later. Clear your desk so it's full of space. If you have any minty chewing gum, chew on some. Peppermint really helps concentration. I happen to have a bottle of peppermint oil that I sniff, and Olbas Oil does the trick too. Close down TSR, close down Facebook and any other platforms you waste time on, and tell yourself that you're gonna work until 2:30pm (it's 12:45pm) now. That's a decent chunk to get started with.
Then go get a cup of tea, walk around just to wake yourself up, go into other rooms of the house. You don't wanna sit in the same room the whole time because you'll get bored as hell. Go back and do another hour or so of work, then reward yourself with some TV or something. Don't use TSR or Facebook as rewards, as you'll just associate the computer with them, when you need to think of it as a tool for revision.