Migraines :: Headaches With Flashes Of Lights

For years now I have experienced pretty regular headaches and occasionally I would get migraines. But when I was in a car accident in June, where I fractured my skull, had right temporal lobe hemorrhaging, and about a 9 day laps of time that I remember nothing off, I of course had terrible headaches right after the accident but when those went away I began to get frequent migraines. My mother, being a nurse told me to keep track of them because my injuries and symptoms put my at risk for seizures. Last week and this week I have experienced severe headaches or migraines almost every night but something has been different. These headaches have only been coming late at night, almost early morning, and when they happen I try to go to sleep. When I close my eyes (while the headache is still happening) I see flashes of light, like a strobe. They are very fast, one after the other. The flashes only stop when I open my eyes or when I finally drift off to sleep. I've never experienced anything like this. I am aware that many migraines can cause auras and flashes of light but I have never had that happen before and it's never when my eyes are open. My vision itself is never effected. Only when I close my eyes. Is this something I should be concerned about? Is it normal?