Nightcap

noun

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

   "Winston wore a nightcap to stave off the cold."

2. A beverage drunk before bed that is usually alcoholic.

   "I'll make myself a nightcap of whisky and lemon before heading to bed."

3. (by extension) Something the person reads or listens to before bed.
4. The final match of a sporting contest, especially the second game of a baseball doubleheader.
5. A cap drawn over the face of the condemned person before they are hanged.