This article positing a link between neuroticism and creativity discusses a correlation with no known mechanism, so we can speculate unencumbered by data. Mr WCE and I both have trouble turning off, and for him especially, that leads to sleep difficulties. I can’t tell how neurotic I am, but I know I spend a lot of time living inside my own head. When I spent a month in the hospital before my twins were born, it was hard to read books and so I mostly did Sudoku puzzles and thought, with some listening to music. Apparently not everyone is like that.