At Night or In the Night? - English Language & Usage Stack Exchange
The same with in the night, if someone said that you would think of any time between the hours of 8pm and 6am, or thereabouts. However, at night generally means the specific time between when night begins and when you go to sleep, let's say between 8pm and 10pm. It's similar with other specific times of day, such as at midnight or at noon.

Is the expression 'of an evening', 'of a morning', 'of a Saturday ...
“Some speakers of vernacular English varieties, particularly in isolated or mountainous regions of the southern United States, use phrases such as of a night or of an evening in place of Standard English at night or in the evening, as in We’d go hunting of an evening.”

What's the difference between “by night” and “at night”?
"The tiger hunts by night" sounds more dramatic than "The tiger hunts at night." Consider the title of the following film: They Drive by Night, which is a hyped-up way of presenting a movie about truck drivers who are trying to survive in their tough world. Had the film been called "They Drive at Night" it would have sounded pretty ho-hum.

meaning - How should "midnight on..." be interpreted? - English ...
The convention stems from the term itself. Midnight comes from 'mid-night.' In conversation, the 'night' of which 'midnight' is in the middle, is considered the night of the date mentioned. If you are referring to a deadline, this also will refer to the stroke of 12 after the evening of the same date. Example: The paper is due by Friday at ...

What is an appropriate greeting to use at night time?
"Good night" as a greeting was once a feature found almost exclusively in Ireland. In James Joyce's "The Dead", for example, it is used both as greeting: —O, Mr Conroy, said Lily to Gabriel when she opened the door for him, Miss Kate and Miss Julia thought you were never coming. Good night, Mrs Conroy. And as a farewell:

word usage - 1 o'clock in the morning OR 1 o'clock at night? - English ...
'Night' is defined as: "The period of time between 'Evening' and 'Dawn' ". People tend to get confused at the difference between the terms 'DAY' and 'DATE'. If it is Monday and it becomes 2 a.m., since the light of the sun is no longer visible in the sky then that is the 'Night-of-the-previous-day", so it is 'Monday-Night'.

ambiguity - When is Christmas Eve Eve? - English Language & Usage Stack ...
And the night before that was Christmas Eve Eve Eve Eve. SANTA: I know dear. MRS.CLAUS: My favorite is the day after Christmas. That's when I get to say Christmas followed by 364 Eves. Christmas Eve Eve Eve Eve Eve... (Rough Night at the North Pole, first performed 12 December 1987, Group Repertory Theatre, North Hollywood California)

Is there a term for the period between midnight and sunrise?
@Mitch On a related note, the OED entry for “small hours” gives “the early hours after midnight denoted by the small numbers, one, two, etc.” Interestingly, the 1st citation is from Charles Dickens in 1836: “He invited friends home, who used to come at ten o'clock, and begin to get happy about the small hours.”

What do you call the star that appears before night (evening)?
The Evening Star, a large bright light which often graces the night sky after dusk, was called Hesperus by the ancient Greeks. The god Hesperus was the embodiment of this so-called 'wandering' star. The god Hesperus had a sibling, a half-brother, Phosphorus.

word usage - "Good night" vs "goodnight" (vs "good-night") - English ...
Looking at the ngrams of both, good night has a more frequent use. Goodnight has only appeared recently, suggesting that it has been introduced – but is correct to use. I would write "Goodnight, sweetheart" and "Have a good night". I also think that "goodnight" is just a shortened way of saying "have a good night".