Re: morning.
The natural thing is when it is dark, it is “evening”, when it is daylight, it is “morning”.
I think a more appropriate word to use in both cases are:
* 06:00 to 18:00 = daylight or daytime
* 18:00 to 06:00 = nighttime
Which will free up “morning” and “evening” to mean before or after 00:00.
In any case, I think it only exists in English?
Because in the Tagalog and Filipino languages, “umaga” and “gabi” simply mean “daytime” and “nighttime” or “day” and “night”.
^_^