nightcap

The story

From night + cap.

First known use, by meaning

• From 14th c. A warm cloth cap worn while sleeping, often with pajamas, being common attire in northern Europe before effective home heating became widespread.
• From 1818. A beverage drunk before bed that is usually alcoholic.
• From 1939. The final match of a sporting contest, especially the second game of a baseball doubleheader.