MHO brain shut down

I’m still in the early phases of learning Monday our one. I’ve been working with it for three weeks, but I find it hard to put all of my work tasks in my calendar. I usually can populate the schedule for Monday and Tuesday but then find myself getting distracted by my own thoughts about how to fill in the rest of the week. I find myself staring at my list and my mind goes blank.
I know the point of Monday our one is to let my prefrontal cortex, but I think my prefrontal cortex is shutting down!

It usually takes me about an hour to hit that level of shut down, and then I walk away from it and try again the next day. But it keeps happening. I would like some help about what questions I should be asking myself.