No sacred cow exists of creativity. Just sit your butt down if you wanna write (or create). Or maybe, lie down, get drowsy and let your subconscious take over. It happens, you know, those moments of incredible, diamond-sharp revelations, right when you're sleepy.
Keith Richards talks about it in his new book Life. He was interviewed by Terry Gross about how he came up with the song Satisfaction. He sleeps with a tape recorder by his bed to capture the goodies. He doesn't even remember having taped the hook for the song. He woke the next morning, and there it was along with 40 minutes of snoring. Love it.
I've met others who mention something similar. I have writing tools handy by the bedsheets, and occasionally, I'll get an idea that's gotta go on the paper ASAP. But, frankly, I do best by showing up. Let me have the time, and it'll flow. I plot and it helps, but I've got to give it space.