Interesting thing about all of this is that it is also seen in sighted folks who
have unusual sleep schedules. The must interesting question to all of this is
whether it is actually a disorder or a result of physiology -- its a chicken and
egg question.
Tom
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html