Daydreaming is often because of a strong imagination and a weak will or attention. Some of us are so caught up in our daydreams that it is difficult to focus on our work. I went through this link recently -http://www.innerfrontier.org/InnerWork/Archive/2010/20100712_Scatte.... If one looks at the article on passive attention, it hints at a possible solution to reduce daydreaming. One can go through the entire attention series and come to one's own conclusions.