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Article:

Do Not Click This Link -- 14 Ways to Manage Distractions at Work

Tips for Identifying, Managing & Overcoming Workplace Distractions

12. Unplug & Tune Out

OK. This is going to hurt a little. Brace yourself. 

Silence your phone and disconnect from the Internet. At the least, set your email to download at intervals instead of on a continual basis. Shifting focus takes time, so limit the number of times you need to relocate your thoughts. Dam the data flow for a few minutes. Create a serene oasis in which to tackle the most demanding items on your agenda.

Relish your temporary gigabyte barricade, and your brain will begin to adopt this as a performance cue to focus and achieve.