My night shift coworkers bring in PS5s and Xboxes and set them up every night. I felt guilty bringing in a switch or 3DS on holidays I knew would be dead when I worked on nights. A handheld seems somewhat acceptable to me as it can just be turned off and thrown in a bag when it gets busy.
Now that I’m on days I read semi related technical books of things I’m interested in or hack around on a pi or Arduino that may or may not lead to something useful for work. That way I can say I’m learning my job better even if it’s stuff I’d do in my free time. Boss seems to like that.