Right, so then in a single night in a poorly ventilated room, a human would not breathe up enough of the O2 to make any difference in their functioning? (Meani

Right, so then in a single night in a poorly ventilated room, a human would not breathe up enough of the O2 to make any difference in their functioning? (Meaning we could rule it out as an explanation for the effects, if the effects do exist)