Exhaustion makes everything feel more permanent than it actually is.

When you are depleted, everything acquires a sense of permanence. The problem seems structural rather than temporary, the mood seems like your nature, the situation seems fixed. That impression is a symptom rather than a perception, and it lifts when the tiredness does, which is why so many things look different after sleep. Judging your life from inside exhaustion is like reading in poor light.

Make a rule that big conclusions wait until you are rested. Write them down instead of acting on them. Then look again in two days and see how many still hold their shape.