A part of me wants to scold you that you need to balance your leisure and work, but I totally understand how one can be consumed by his work and vision. I have the same problem :)

But I usually find that a few hours in the "middle" of the work night spent socially with friends or in a club do wonders to my concentration afterwards.

And even more important we need to get our heads out of the fox holes once in a while otherwise we lose a lot of our creativity and very few things are more important in this field.