We spoke about it a lot at hte university, but today I experienced all the power of it.
I couldn't work, because my primitive needs weren't satisfied. I wanted to eat, to sleep, and ...
Yes, really, it influence a lot on the work you do, becuase you can't have an inspiration, while thinking all the time about your stomach or your eyes, which are going to close each minute.
From the other hand, sometimes, when you feel yourself hungry and sleepy, you are run by some inner strength, inner inspiration. Something is leading you to your idea.
Want to be actually in that mood.