Of course it is blessed. Blessing is something that comes uninvited. You are a real blessing. Being obsessed with a dead end is a character, and thinking about things is an advantage. Mental exhaustion is two sides of things, with advantages and disadvantages. But can we try our best to avoid this drawback? Is it enough to let something affect us? For example, don't drill for some meaningless things. Everything is measured and has a great influence on yourself, so let it be.