[Blindtlk] chalking everything up to blindness

[Robert J Smith]

Hi all.  I definitely agree that there is a tendency for health 
professionals to chalk problems up to blindness, but I believe in the case 
of sleep irregularities, there is solid evidence that shows that the brain 
actually needs to see light to keep its day and night cycles regulated. As 
I understand it, when the brain sees light, the production of melatonin 
which causes a person to sleep is held in check.  When a person is in the 
dark, then melatonin is produced, causing sleep.  If a person does not see 
light at all, to the brain, the person is then in a perpetual night 
surrounding so melatonin could be produced at inappropriate times causing 
drowsiness during those times.  Possibly the taking of Melatonin 
externally, regulates this a little more.

Bob Smith

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