Which term is often used to describe very late night or early morning hours?

The term "wee hours" specifically refers to the early hours of the morning, typically the hours just after midnight and before dawn. This phrase conveys the notion of a time when most people are asleep, emphasizing the quiet and stillness associated with these late-night or early-morning hours. It is often used in expressions that describe activities occurring at that time, such as "It happened in the wee hours of the morning."

In contrast, the other terms have distinct meanings and are associated with different times of the day. "Midday" refers to around noon, when the sun is at its highest point. "Afternoon" is the period after midday and before evening, generally associated with the time between noon and approximately 6 PM. "Sunset" denotes the moment when the sun disappears below the horizon, marking the transition from day to night. All of these options represent times that are not relevant to the very late night or early morning context that "wee hours" captures.