When I begin a task, I begin it all or nothing. Perhaps this is part of my moderation issue, but I begin these things with singular focus. Some might even call this compulsion or fixation. This has been a blessing and a curse for me. I suppose it depends a lot on the project, and the effect it has on the rest of my life.
There have been many times when I throw myself into a knitting project and I cannot stop, even if it's two in the morning and I'm literally falling asleep at the needles. Times when I don't get up out of the chair to check on my crying child because I'm not at the end of the row, or because I'm just three rows from the end. In cases like this, my focus is actually detrimental to my self and my family, although I do get the knitting project done quickly.
On the other hand, I can also bring my complete focus to playing with my children. In those moments I have eyes for nothing but my children's' joy. I don't see the mess they make, or the dreads in the back of their hair. I don't see the ballpoint pen all over my daughter's legs, or the fact that my son is eating his boogers. I'm completely, single-mindedly focused on the experience of being engaged with them. It's magical.
It's sort of like having a super power, this focus. I just have to use it for good, rather than evil.