Re-reading a book of interviews with Beat writers and poets, I realized many talk about breath and meditation and how it pertains to the writing practice. Here's Allen Ginsburg lecturing an NYU class in the mid-90s:
"So the basic classical practice is paying attention to the breath leaving the nostril and following the breath until it dissolves, not controlling the breath, just any regular old natural breath that comes along will do. What you are adding is your awareness of the breath rather than any control...When you notice you are thinking, label it thinking and take a friendly attitude toward your thoughts. That is the nature of the mind to think thoughts."