The machine we use so much for work-our computer – is the same machine we often use to have fun. So control how you use your computer. If your problem is that you check your email every five minutes, you can get programs that stop the Internet from working for a period of time you choose. Use this time to focus on your work. But you shouldn’t work for hours without a break. Work for 25 minutes, and then have a five-minute rest. Rewards are really important, too. Have a biscuit or get some fresh air every hour or so.