Why do SF businesses close early? (Researching for a public policy project)

Heya! I lived in a variety of cities around the world, and SF has the absolute shortest operating hours I've seen. Elsewhere, even in smaller cities, I've seen streets still be quite lively around 10-11pm. I'm used to a typical coffee shop staying open at least 8am - 8pm, but some of my favorites here close as early as 3pm.

I'm curious what sort of explanation y'all have for this phenomenon? I'd appreciate an indication of how much of your suggestions are speculation vs. experience, too!