They say don't go grocery shopping when you're hungry. Don't go bar hopping right after you get paid. Don't count your eggs before they hatch.
Don't write when you're exhausted.
I write reams when I'm exhausted, and it's generally pretty good stuff, sometimes even get diamonds and gold. But when I come back later, the rewrite is ridiculous.
I've been doing thought experiments again, mind games on myself, teasing out the last dregs of honesty still hiding in the cracks. Stuff I never say to people in real life, or never write down. Stuff that actually matters. Stuff that's sad.
The hardest rewrite is the stuff that's sad.