Andrew Huberman engages in a second bout of learning or creative work in the late afternoon, which is caffeine-free and follows a non-sleep deep rest protocol.

“And then I'll do a second bout of learning. I'll do some sort of work that either involves linear analysis of something. So maybe numerical work or I'm trying to learn something. I generally try and really use those bouts of 90 minute focus energy after the non sleep deep rest. And as I mentioned in previous episodes, there's a lot of evidence, that these non sleep deep rest protocols can enhance and accelerate plasticity.”