I do not have insomnia. I have sleep delay syndrome, Circadian rhythm disorder, Non 24. What I have is not treatable with light therapy as is S A D.( seasonal affective disorder, labeled winter blues by the doctor who studied me at N I H. Two different things. One treatable, one not. One life-changing , one not. One neurological, one not. Even many doctors know nothing about sleep delay, once called phase lag. Google or Wikipedia and there is a lot of information. Once, it was considered a mental illness. Now, it is a legal disability if it has been diagnosed by a sleep specialist or a psychiatrist. Please check with your doctor, call social services, call your insurance, call a medical school. Call anyone with knowledge. Don't go to the few-hours-sleep-study- practices that exist mainly to call it sleep apnea and sell machines.(Grammarly wants me to put a "to" in front of sleep. Wow, who can you trust?) Good luck to all. Sweet dreams whenever you do sleep.