Interesting articles.. thanks to you both.

New2TX,
wow, I never knew anything about that!

Fascinating info. in that article to add on with all I've read in the circadian rhythm studies. That's a keeper.

There are a few references at the end of this paper regarding melatonin and patients with visual impairments. I just remembered it. I'd posted it in TS forum 'cause the doctor involved is involved with treating patients with Tourette Syndrome and other conditions.

article - Melatonin and multiple disabilities
Melatonin therapy for circadian rhythm sleep disorders in children with multiple
disabilities: what have we learned in the last decade?
James E Jan* MD FRCP(C), Professor, Child Neurology,
Mental Health Research Unit;
Roger D Freeman MD FRCP(C), Clinical Head of
Neuropsychiatry Clinic, BC’s Children’s Hospital, University
of British Columbia, Canada.