I would say this is your subconsciousness telling you: "Hey buddy, I've heard you were dead serious on CTB, so here's a little bit of something to change your mind". It's a form of SI which works in a way that it recognizes that your actions in the short future will cause harm to your body and may endanger its existence, so it tries to trick you into believing that "Wow, thing A really seems fun to do, and game B is really fun to play". While it may be a good thing, it is ultimately a form of "early" SI kicking in.
I've also fallen victim to this thing. Every time I'm dead serious that I want to CTB asap and start making preparations, setting dates, writing notes, a new update comes out in my favorite game and I'm like "Nah, today is not the day".