English version

heavy sleeper

From Longman Dictionary of Contemporary Englishheavy sleeperheavy sleeperSLEEPsomeone who does not wake easily heavy
Examples from the Corpus
heavy sleeperSome people who sleep next to snorers are able to tune out the sound, if they are heavy sleepers.Mrs Fairfax is a heavy sleeper, like most old people, and didn't hear anything.Or else she had become a heavy sleeper over the years.
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