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Writing is a mode of thinking to me. The implication is, that when I am not in a good state to think, I am also not in a good state to write. Lack of sleep, job, being interrupted regularly can curb any outcome easily. Maybe that is why there are so many anecdotes about writers who do their writing first thing in the morning, well rested, not yet bothered with the trivialities of the day. I might give that a try in a few years, when the mornings are mine again.