One of the creative newsletters I get in my inbox is from Box of Crayons:

http://www.boxofcrayons.biz/outside-the-lines/06-08.html

This issue has an article on the importance of taking a vacation without the electronic gizmos or allowing any disturbances. Good advice.

When you get creative, don’t allow interuptions. Plan the time out ahead of time and/or schedule a time everyday and do what you have to to keep it sacred.