While we may complain that we never have enough time to get everything done, that is probably a lie at least some of the time. The fact is we like to procrastinate.
Its the bane of every student's existence. I'm so bad at it that I cannot function unless I'm in crunch time, even if that means my work will suffer. However, Entrepreneur.com has a list of useful strategies to beat the reasons why people put things off. Read the article here: http://www.entrepreneur.com/management/managementcolumnistscotthalford/article206834.html