I have no idea how to get into the Zone. It just seems to happen for me.

Usually it happens when I am working on problems that are more interesting to me, especially if it is something that I want to tackle. The day flies by and you have something tangible to look at, or at least significant progress on some project. Usually, you have no idea what time it is, just that all of a sudden it's time to call it a day.

It's a great feeling and happens too infrequently.