Your sleep disorder may qualify for protection / 'reasonable accommodation' under the ADA.
I wanted to have exams proctored at 7PM-9PM. My logic and reasoning fall extremely short at 8AM. I can sleep for 12 hours from 8PM to 8AM and still feel exhausted. Nothing is as rewarding as the sleep I get during daytime hours.
Nootroics, amphetamines, melatonin, all seem to fail.