Eric, remember that the blindness community is "larger", more accessible for
study, and funding for such is far more available.  If you've been following all
this sleep disurder stuff you'll be aware that there has been a good bit of
advertising and requesting blind people to participate in studies for a couple
years.  For interesting information look up who funded this stuff initially.

Tom


Tom Brennan  KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html