It’s night from sunset until dawn. And if someone said “in the morning” I would never interpret that as meaning before dawn.

It is controversial, because one definition of “morning” is dawn to noon and another is midnight to noon. And saying “night” is “sunset to midnight” is also new because you just came up with that.

Morning and predawn are typically the times immediately surrounding dawn, not the time immediately after midnight.

If you told me “were going out to take photos at predawn” I’d assume you meant blue hour photos, not moonlit photos.