Questions my teacher asked me that are on my SAT exam.
Why do we wait until night to 'call it a day?'
How does turbulence work?
How do we store and retrieve memories?
Why do we dream?
Explanation:
1: This idiom is a descendant of the above. It chiefly means to go to bed in the sense of stopping the activity one has been doing for the night. (I'll answer all correctly if you mark me "brainlist", notify me if you choose.)