Adding Time brings the two into a comparison of time periods. Saying just Day and Night compares the non-time/instantaneous status; light and dark, up and down, inside and outside. This is the purpose of the usage, not a time period.
Yahoo! Sports: UFC Fight Night Paris: Imavov vs. Borralho Livestream — Here’s How to Watch the MMA Event Online
The Ultimate Fighting Championship travels to “The City of Lights” for UFC Fight Night Paris. French fighter Nassourdine Imavov (16-4-0) takes on Brazilian Caio Borralho (17-1-0), as the main card’s ...
UFC Fight Night Paris: Imavov vs. Borralho Livestream — Here’s How to Watch the MMA Event Online
Sports Illustrated: Major UFC Fight Night Card in Paris Reportedly Set for September
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?
At night or In the night - English Language & Usage Stack Exchange
- 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.
At Night or In the Night? - English Language & Usage Stack Exchange
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. You will see it very frequently in the construction X by day, Y by night. Some examples: ...treated it like a greasy spoon by day and a hotel by night I mean, if it's -- if it's somebody that is -- is living as a ...