Why do we sleep?

Naomi kestrel at unm.edu
Thu Mar 3 21:14:38 EST 1994

>>My apologies--a bit of an exaggeration there.  The situation, as observed
>>from a second-hand viewpoint (as I am asleep at the time), is that, upon
>>falling asleep, my body starts to radiate quite a bit more heat than it
>>does under waking conditions.  I haven't noticed a similar radiation with
>>other adults, but have observed an increase in heat radiation by infants
>>during sleep cycles; I wonder if there may be a connection.  Personally,
>>the increase of temp when I fall asleep is dramatic enough for another to
>>tell immediately that I am "over the brink".  Has anyone else noticed this
>>phenomenon, or have a hypothesis about it?
>OK, you are talking about two completely different things here.  An increase
>in the heat radiating from your body is not the same as an increase in 
>body temperature.  It is well documented that body temperature falls
>upon entrance into non-REM sleep.  One way for the body to reduce its
>temperature is by increasing radiative heat loss.
>So are you talking about an increase in body temperature or an increase in 
>radiative heat loss?
As there is no practical means of gauging body temp while asleep without
awakening me, I cant reply on that level.  Radiative heat, however,
increases substantially upon entrance into the sleep cycle.  


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