Surlymuse argues that not only should we write when tired but sick or just hate the world. There is very pertinent advice here about the importance of writing every day. If there is anything good about being in these conditions, of course, it is not only that we can bust them by writing anyway but also offer our pains up.
In a perfect universe, I’d begin every writing day with nine hours’ sleep, a perfectly brewed cup of coffee, nothing on my work schedule, and a gentle rainstorm to keep me from even thinking about going outside. I’d have a clearly formed idea, a flawless outline, and several unbroken hours to work.
While I’m at it, I would also like to write with telepathy from the seat of my private jet while I get a neck massage from a Czech supermodel.
Writing when you’d rather not is one of the most important skills you can ever cultivate as a writer. Anyone can write when they’re feeling fine and the muse has just hit them between the eyes like a thunderbolt from Valhalla. But there will be days when every syllable is like a back-alley fistfight with a rabid hobo. That’s when your mettle really gets tested.