You know that first time you wake up in the morning, but it's not time to get up? You still have 27 minutes. You waste 27 minutes laying there because you have to go to the bathroom, but you don't want to get up because it's not time to get up. So instead you think you'll doze back to sleep but you can't because, well, you know. You toss and turn, waste the 27 minutes, get up, take care of business and now it IS time to get up.
Why, oh why don't I just get up right away and give myself back those 27 minutes? It certainly weren't a pleasant way to spend 27 minutes. What a waste!