Boredom makes a lot of bad decisions look like adventures.

An empty evening creates pressure, and the mind will accept almost any plan that promises something happening. In that state, risk reads as excitement and a bad idea reads as a story. It is not that you stopped knowing better. It is that the alternative was another hour of nothing, and nothing is hard to sit in.

Notice the specific hour where your week goes flat, because that is where most of it starts. Have one thing ready for it that you actually like doing. Boredom handled in advance stops making the decisions for you.