I have done no scientific study of this, but I have read about it elsewhere and have experienced it. One of the issues that kept me from sleeping well was that I would be thinking about things for some time before I fell asleep. As a consequence, I would wake up at least once a night. Since I have started blogging regularly, I cannot remember awaking in the middle of the night. If I did wake up, it was within a half hour of when my alarm clock would go off. I think that is pretty cool.