Have you tried reading or learning? I've always a book in my bag for unexpected breaks. Depending on the topic or book, you can easily go from something else to reading and back to work.
Lol. When I was at basic training (Canadian military) we of course didn't have cellphones or computers, but were allowed books. The image burned into my mind is of my platoon on a rainy day in the woods. Everyone is in camo/weapons, huddled together to keep warm while waiting for a truck … reading game of thrones. Those novels were better protected from rain/mud than any weapon.
I have a dozen projects that I could be working on. But it is a Sunday. Canada day. Tomorrow is also a holiday. The bosses aren’t here. Other than us and the guards, the building is empty. Nobody is in the mood for the never-ending stream of online courses we are supposed to work on in our free time. It is Xbox and the web until quitting time.
A month ago there was a thread about the "one book that changed your life": https://news.ycombinator.com/item?id=17168136
I read Mindset by Carol Dweck since then and found it very interesting (and applicable to some parts of my life and behaviour).