How do you say '自然醒’ in English?
自然醒 is a popular phrase in colloquial Chinese. It means' wake up without alarm when you have had enough sleep'. How do you say it in English?

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I would say "wake up from a full sleep" or "wake up after a full sleep".

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I guess you could say 'Wake up naturally' - but that might not be clear. 
It would be safest to say 'wake up without an alarm when you have had enough sleep'!