I suppose after what you've said it's no use asking you to have a nightcap, Vane?
A mug of mulled claret for a nightcap, and a good sleep, will set you all right.
Do you remember the story of the 'Doctor' in the first Nightcap book?
This is the night-shirt, and formerly a "nightcap" was used by some.
The word 'nightcap' is spelled with and without a hyphen in the text.