Loose leaf tea, re-steeped several times over the course of the day. The caffeine content goes down with each successive stepping, but good quality whole leaves will still let you get several cups out of them.
I stop making it at 3, which usually gives me enough time to metabolize it and sleep normally.
There’s a big difference between a $100 sound system and a $1000 sound system. I’ve gotten the “audiophiles are dumb” lecture for suggesting someone upgrade from 2x4" computer speakers to actual studio monitors for working on their music. But their speakers literally could not reproduce some of the frequencies thru were trying to make, so they mixed the bass WAY the fuck too loud.
But yeah, diminishing returns start to kick in around that point. Quickly becomes the eternal story of a Fool and His Money.
The most proper use for a Real Book.