Have you considered that it might be Circadian in etiology?
I used to work 7-7s as an RT about 12 years ago and if I had known about Melatonin,I would have certainly used it.
There are 1mg sublingual doses and 3mg po doses available at General Nutrition Center. Use it before going home while you adjust the timing of the dose for optimal performance. Melatonin metabolizes into the hormone that your body would normaly release in response to the onset of darkness.
Hints: Make the room you use for rest dark enough to make a vampire happy.
Unplug the phone and under no circumstances answer it.....................it will only be an evil
manager asking you to pick-up a shift,or an aquaintence wondering why you are still in bed at 1pm
You must accept that you are now in a different world. The social activities you enjoyed as a "day person" are now rescheduled or canceled. You are now a night person and can't understand why anyone would go to bed before 3am on thier day off.
Force yourself to your darkroom and avoid daylight during hours of rest. If the path to the bathroom is exposed to light.....................fix it. Stay in darkness for your scheduled sleep pattern!
After you form a habit,it will come naturally