There are some studies according to which melatonin can be used to good advantage for controlling blindness related sleep disorders. I have been using it successfully for a few years. I source it very inexpensively in 720 tablets jars from vitaminworld.com. G. Guido Dante Corona IBM Research, Human Ability & Accessibility Center, (HA&AC) Austin Tx. Phone: 512. 838. 9735. Email: guidoc@xxxxxxxxxxx Web: http://www.ibm.com/able ". . . Maybe it was only those who were most certain they were right who were guaranteed to be wrong. And that maybe, just maybe, those who questioned the most were in the end those who came closest to being wise." [David Poyer, The Command]