Before I sleep, I download a set of podcasts for the commute the following day on Pocketcasts. Mine are usually about ML, Freakonomics, Startup School, and AI. But you go try whatever you want. I find that it's best to spend idle time listening to intellectual background sounds (if you're at least not listening to them).

I try to avoid any social media at this point. Anytime I find myself on Facebook or Twitter for more than 3 minutes, I kill the tab and get back to focus on work.