It’s because you’ve let go of the day, you’re resting, sleeping, and your subconscious is romping along working on the challenges you have thrown its way – And BAM – it has something for you and it can’t wait to tell you all about it.
So there you are, in the dark, your eyes wide open, and you have your answer. Some problem with plot, characterization or dialogue – suddenly you have the words and they are BEAUTIFUL.
The days are full of distraction for writers, family, work, chores, shopping, just dealing with day-to-day issues. It all steals away writing moments, writing time, writing reflection. Those middle-of-the-night moments become treasures to a writer. There’s no distraction, nothing needs to be done. We learn very quickly to take advantage of such times. Tired or not, grabbing it while it’s happening is all important because it might not come again, not like this, here and now, with these words, this picture, this solution.