Don't Go to Bed on an __ (advice to Couples)

This page is the CodyCross answer for the clue below from TV Station, Group 610, Puzzle 2 (Game of Thrones).

Question is: Don't Go to Bed on an __ (advice to Couples)

and the answer is: ARGUMENT

Word Meaning:

ARGUMENT — (countable, also figuratively) A fact or statement used to support a proposition; a reason.

Definitions from Wiktionary.

Don't go to bed on an __ (advice to couples) — CodyCross Answer | CodyCross Solutions