Technically it's always after midnight. And before midnight too.
Time is relative and it's rather arbitrary to say "not meant to be awake after [insert human concept of period of time here]" as if the biological brain has any connection to that concept.
Depending on seasons and latitude, midnight varies wildly.
Depending on the accuracy and settings of the clock you use to tell time, midnight, noon and any time in between varies widely. Midnight GMT or midnight your local time zone? Midnight is just an arbitrary human notion of time description and biology is completely disconnected from it.
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