Winning the last word usually costs you the last hour of your night.

The final word is worth far less than it feels like at the time. What it buys is a brief satisfaction, and what it costs is the rest of your evening, since your mind keeps replaying the exchange long after the other person has gone to sleep untroubled. The trade is bad and it gets made almost automatically.

When you catch yourself fighting for the last line, stop and let them have it. Nothing about your actual position changes by conceding it. You get the hour back, which was the part that belonged to you.