A day-to-day occurrence (5)

I believe the answer is:

night

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'occurrence' is the definition.
(I know that night is a type of occurrence)

I can't explain the rest of the clue.

(Other definitions for night that I've seen before include "See 9" , "'She walks in beauty, like the . . . . .' (Byron)" , "Opposite of day" , "For most, the time for sleep" , "follow-up to 16 [TWILIGHT]" .)

I've seen this clue in The Globe and Mail.

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