At Night or In the Night? - English Language & Usage Stack Exchange
1. The origin of "at night" to indicate a point of time and the usage of prepositions "in" and"at" In olden times, when the time expression "at night" was originated, night might have been thought as a point of time in the day because there wasn't any activity going on and people were sleeping that time unlike daytime.

Is 'Night an acceptable informal variant of "Good Night"?
The spoken use of "night" as an informal, familiar version of "good night" (wishing one a restful sleep) is common, but I'm not sure what the proper written equivalent is - if there is one. I have ...

At night or In the night - English Language & Usage Stack Exchange
What can I say about a thing happened at night? Someone stole my phone at night. OR Someone stole my phone in the night. Which one is right to say?

word usage - 1 o'clock in the morning OR 1 o'clock at night? - English ...
4 Morning means after I wake up. Night means after I go to bed. 1 o'clock in the morning means you've woken me up so knock off that damn racket. 1 o'clock at night means I've have fun staying up late so stop complaining about the racket I'm making. So yes they both mean 1 am. The way we talk about time has a lot to do with how we feel about it.

What's the difference between “by night” and “at night”?
The expression by night is typically used to contrast someone's nighttime activities to their daytime activities, especially when the nighttime activities are unusual or unexpected.

On this night vs In this night - English Language & Usage Stack Exchange
In this night of wonder or On this night of wonder, which is correct? The full context is God from heav’nly splendour Comes to earth below; In/On this night of wonder, The world is all aglow.

What is an appropriate greeting to use at night time?
“Good night” or “good evening”? I am in the process of creating a software application which displays a greeting to users based on the time of day. I have come to a blank on what to display to the user when it is late at night. 'Good night, [user's name]' just doesn't seem right. So, what is an appropriate greeting to use at night time?

Evening and night in English - English Language & Usage Stack Exchange
How exactly are the words 'evening' and 'night' used in English? Are there certain times when evening, and when night, are considered to begin? Do these periods overlap?

single word requests - Precise names for parts of a day - English ...
The set of words that refers to the sky is: dawn (sky is getting light), sunrise (exactly when the sun is first visible), day or daytime (between sunrise and sunset), sunset (exactly when the sun is last visible), dusk (sky is getting dark), night or nighttime (sky is dark).

Usage of "last evening" - English Language & Usage Stack Exchange
I have heard my friend say yesterday evening or yesterday night. I tell her it's last evening or last night. While she may be correct in that it is the night of yesterday, why is it then called last