In article <32FFA793.A6F at qmail.com> j at qmail.com writes:
>Patrick Juola wrote:
>>> >Are you saying that the a higher CO2 level in a crowded room
>> >does NOT cause drowsiness?
>>>> I'm saying that it does not do so by binding more tightly to the blood
>> hemoglobin than oxygen does.
>>Hi Again Patrick,
>>Do you agree with Ralph that increased CO2 -- one way or
>another -- causes the drowsiness that overcomes people in
>>Or do you have no opinion on this aspect of the question?
Mostly I have no opinion, since there are so many interacting things
in lecture-halls, including the quality of the speaker, that can
cause drowsiness. If I had to hazard a guess, I would suggest that
it's hypoxia -- oxygen simply being used up through insufficient