One way to hold hangover: yesterday has not finished with you yet. Something from the night before, or from a much older time, is still hanging over today — heavy, unwanted, and clearly out of place now that the occasion is over. The word is always about the leftover, never about the good part that caused it. That is why it works the same way whether what is hanging over you is last night's drinking, this morning's sugar, or a rule from fifty years ago.
From the word’s history
Wiktionary gives hangover as American English, formed from hang + over, with the drinking sense first recorded in 1904 and the sleeping-over-a-rope sense in 1894.
來源資料說 hangover 是美式英語，由 hang 加 over 組成；喝酒的意思大約 1904 年開始有紀錄，睡在繩子上的那個用法則是 1894 年。字面上的「掛過去」正好對上今天的用法。
Wiktionary entry for 'hangover' (kaikki extract, source_ref kaikki:3f6f69a190036ae4:963662947): 'American English; hang + over. First sense was first attested in 1904. Third sense was first attested in 1894.'
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