I found this great item: 5 writing tips by Dinaw Mengestu in Publishers Weekly. Mengestu is the author of ALL OUR NAMES and has a host of honors and awards.
This is from Tip #4 about growing “less precious” about conditions under which writing happens.
Steal time from the crowded world even if it’s only a few minutes, or a blessed hour. Take being tired and emotionally exhausted as an excuse to take excessive liberties with language, with your imagination.
I am often tired and emotionally exhausted. How wonderful, instead of always bemoaning this fact, to think of it as liberating.