1) Do you say "We can stay here until late night" or "We can stay here until late at night/late in the night" or "We can stay here late into the night"? You might say "We can stay here very late tonight." 2) What about "we will talk about this later at night/in the night"? And "I won't leave until early afteenoon/early in the afternoon"?"? We will talk about this later tonight. I won't leave until the early afternoon. 3) I know you say "the boss's fair-haired boy." and "The lowest man on the tottem pole" ... But what if the person is a woman? "The boss's fair haired girl"? "The lowest woman on the tottem pole"? Either. People would understand if you used boy/man but you could change it too.