Midazolam, and other benzodiazepines, do not cause Stage III of anestesia, which is being knocked out. They do however cause heavy sedation and amnesia. What this means is, when usings these drugs a person does not fully get knocked out, typically added drugs do the final knockout (Propofol or Fentanyl). In that case a person could hear you. That is assuming however they haven't fallen asleep from the medication. Like anyother person who is asleep they probably won't hear you. Finally, even if the person heard you and responded with you (not unual after a short procedure), it is very likely that person won't even remember it from the amnesia.
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