What is the meaning of Nightcap?

A warm cloth cap worn while sleeping, often with pajamas, being common attire in northern Europe before effective home heating became widespread.

A beverage drunk before bed that is usually alcoholic.

Something that a person reads or listens to before bed.

The final match of a sporting contest, especially the second game of a baseball doubleheader.

A cap drawn over the face of the condemned person before they are hanged.

To drink an alcoholic beverage shortly before retiring to bed.

Source: wiktionary.org