Question

Why do we wait until night to 'call it a day?'

Answer 1

Answer:

Dude u can also say it in daylight no issue

Answer 2

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This idiom is a descendant of the above. It chiefly means to go to bed (to sleep) in the sense of stopping the activity one has been doing for the night. ... The sun has set a few hours ago and we've had dinner already, so let's call it a night and restart first thing tomorrow morning.