Two famous lines give the word its romantic glow.
苏轼's quatrain 《
春宵》 opens with
春宵一刻值千金 "a moment of a spring night is worth a thousand in gold", and
白居易's 《
长恨歌》 says of the emperor and his beloved consort
春宵苦短日高起 "the spring night was too short; they rose when the sun was high".