There’s a tired that comes from a wasted day and a tired that comes from a great one. Chase the second kind.

Two kinds of tiredness feel similar in the body and completely different afterwards. One comes from a day that went nowhere, and it leaves you flat and faintly annoyed with yourself. The other comes from something spent on purpose, and it sits well even when your legs hurt.

Notice at bedtime which of the two you are in, since the answer is usually immediate. When it is the first kind, look at what ate the day and change one thing about tomorrow. Aim for the second kind a few times this week, even in small doses, and let the good exhaustion be the measure.