For me, a play is a form of writing which isn't complete until it is interpreted by actors. But it's still a form of writing. And so most of my time is spent thinking about how to write a sentence.
It is all about being open and paying attention to the music in your head. I think most people have original music playing in their heads from time to time.
You must avoid giving hostages to fortune, like getting an expensive wife, an expensive house, and a style of living that never lets you aford the time to take the chance to write what you wish.