Tā měitiān xué dào bànyè, tóngxuémen dōu jiào tā xuéxí kuángmó.
He studies until midnight every day, and his classmates call him a study maniac.
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usage
Internet slang puts 狂魔 after a noun or verb for someone who does it obsessively, often half in admiration: 基建狂魔 'infrastructure maniac' (China, jokingly), 加班狂魔 'overtime maniac'. The older, darker use is 杀人狂魔 'homicidal maniac'.
