After becoming a father, he really cleaned up his lifestyle and stopped staying up late playing games.

clean up 这个短语动词由 clean（清洁）和 up（完全、彻底）组成，字面意思是"彻底清理"。在这里用作比喻意义，表示"彻底改变不良习惯"或"改过自新"的意思。