Nightcap (noun)

A drink, often alcoholic, consumed before going to bed.

Origin:

From the word "night" and "cap" meaning "head covering".

Examples:

1. He enjoyed a nightcap before retiring for the evening.
2. She had a nightcap to help her sleep.
3. The nightcap was a warm milk with honey.
4. The nightcap was a small glass of brandy.
5. The nightcap was a beer to end the night.