Hello Joey_5 My dictionary says "a later sleeper is a person who sleeps late in the morning (=who does not rise early in the morning)". "Night person" or "late-night person would be better if you want to mean "a person who stays up late". The antonym to "night person" is "morning person".
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CalifJimTo describe someone who doesn't stay up very late at night you don't say "He is not a late sleeper". You say "He is not much of a night owl"."A night owl" , we have this same expression in Cantonese!!Just wonder where this expre
If you want to rephrase it, you can just say "He doesn't stay up late" or "He goes to bed early".
CJ