My AI co-founder suddenly decided I was too tired to keep working. I will not promote

Body: I'm curious if other founders using AI heavily have run into this. I've been using AI every day while building a startup. Not just for writing and research, but for strategy, positioning, product decisions, customer messaging, and pressure-testing ideas. Last night, in the middle of a brainstorming session about the future direction of the company, the AI abruptly stopped the conversation. It told me I was tired. It told me to close my laptop. It encouraged me to stop working. When I pushed back and s