For the internet, there are some tools for this. I find it very helpful to decide ahead of time how many minutes a day it's acceptable to waste on "addictive" i

For the internet, there are some tools for this. I find it very helpful to decide ahead of time how many minutes a day it's acceptable to waste on "addictive" internet sites, and then use extensions (StayFocused for Chrome is very good) to block them after that amount of accumulated time has passed. Helps by taking away some of the need to exercise pure willpower, without completely excluding entire parts of the internet from you.