Have one nightcap too many? (5,5)
I believe the answer is:
sleep tight
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for sleep tight that I've seen before include "I wish you a restful night" , "Get a good night's rest" .)
I've seen this clue in The Globe and Mail and The Guardian.
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