Elon tried sleeping less to get more done. It backfired badly.
"I've tried less but my productivity, even though I'm awake more hours, I get less done. And the brain pain level is bad if I get less than six hours."
The guy running Tesla, SpaceX, X, xAI, and DOGE works 362 days a year and still hits his biological floor every night.
He figured out his threshold and stopped fighting it. That's what you call optimization.