But it's great for doing anything indoorsy, for a few possible reasons. Some studies have found that night owls are more creative than others, and sure that's flattering and all, in the way that cherry-picking studies that compliment you can be. But there's more to it than just innate creativity; when you're up late there are fewer people around to disturb you from your great works.
"This will be my masterpiece."
Slate did a great feature last year about the working habits of famous writers and artists, and they found that an inordinate number of them were either early birds or night owls. The probable reason for this is that it's far easier to get creative work done when no one else is awake to call you, or knock on the door, or hug you, or engage in some other awful bonding moment.
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I do a bit of writing myself, and I can tell you that a key step in the process of writing something good is first writing several things that are awful. It's the revisions where the magic happens, but you need something, even something awful, to revise in the first place. It's a lot easier to do this when no one else is around to see what your diseased mind has conjured; I honestly have no idea how people write in busy public places like coffee shops.
It couldn't be an affectation, could it?