An intoxicated customer who becomes very quiet or sleepy may be:

An intoxicated customer who becomes very quiet, drowsy, or begins to nod off may be showing signs of significant intoxication — not all impairment is loud or boisterous. This warrants stopping alcohol service and monitoring the person's wellbeing, since extreme drowsiness or unresponsiveness can indicate dangerous intoxication that may require help or medical attention. Servers should not assume a quiet intoxicated person is 'okay'; the change in behavior is itself a warning sign. Responsible service includes recognizing the subtler, withdrawn signs of intoxication, not only the obvious ones.