I used to be bored at work as I had too much downtime, so I decided to just accept more duties. Was nice to be able to solve problems learn new things and it made the time go faster. But you just keep getting more and more work and responsibilities heaped on you for doing a good job, and absolutely nobody notices it until you start falling apart. Then all of a sudden people you’ve never heard of are ‘concerned’ about you. At this point I am burnt out and do even less work than when I was bored, but the difference is that it also drains me.
The lesson is to never try to work at or around full capacity. Don’t fall into the trap of being bored and deciding to take on more work.