Night or nighttime (also spelled night-time or night time) is the period of ambient darkness from sunset to sunrise during each 24-hour day, when the Sun is below the horizon. The exact time when night begins and ends (equally true with evening) depends on the location and varies throughout the year. When night is considered as a period that follows evening, it is usually considered to start around 8 pm and to last to about 4 am.

In grammar, case changes what a noun, adjective or pronoun does in a sentence. It is a set of forms which depend on the syntax (how the words go together). Case is an example of inflection, which is often an affix, a part of a word that is added to other words, that signals a grammatical relationship.