I have some interests, some of which are related to computer science, such as learning Haskell or working on a side project. These types of activities require a lot of mental energy and it can be difficult for me to have the energy to work on them after spending 8 hours at my job. I'm curious to know how other people manage to do it. Other interests I have, like learning to play the piano, require less mental energy. But to be honest, after spending 8 hours at work, I often find myself doing very passive activities like watching YouTube or scrolling through HN and bookmarking things without actually reading them. I don't want to be like this, but I don't know how to change.