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Hi, I am an American Board Certified Neurologist; the expert to whom this question was originally addressed is not available now so the company has made this question available to other experts too and I am very glad to help you with your health concerns.
Coming to the discussion;
If the numbness is confined just to the upper lip without any other associated symptoms like whole facial numbness, facial droop, speech difficulties, drooping of eye lid, double vision, or new symptoms in his arm or leg (like weakness, loss of sensation) etc then he can wait till morning to go to ED. If he is having any of the above mentioned symptoms then it is important he visits ED tonight itself because we need to rule out a stroke. However if the above mentioned additional symptoms are absent then waiting till morning is fine because stroke is unlikely to present with numbness just isolated to upper lip.
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