Yeah there's a load of people, especiall in SF or on HN, that feel like they should be Doing Something Productive at all times. And it's companies that encourage this, e.g. old Google by offering on-site gyms, entertainment and food, or what a lot of companies everywhere do, offering after-hours "hackathons" with pizza.
But your brain needs rest as well. Stop trying to keep up in the rat race, all the things you try to cram into your brain have a short half-life and will be forgotten or archived into the "things to half-remember and you'll need to look up anyway" anyway.
I mean if you enjoy listening to podcasts while commuting, have at it, I won't judge / you're allowed to have and enjoy things. But if you feel like you HAVE to, it'll cause problems down the line.
Don't feel guilty about "wasting time" either, if you enjoy watching TV, playing video games, or sleeping instead of doing a 5 AM run, have at it. Don't deny yourself too much.