i never had sleep issues before head injury and I always sleep soundly.

Now I take Elavil 10 mg and I sleep for about 10 hours and only some nights I wake up once to use the bathroom and go back to sleep immediately.

When I was at the hospital for 3 days probably they measured my O2 levels too constantly. They didn't say there was any issues with that except my heart rate goes very low during night may be in 30's. My heart rate always low even before the injury. Now I am confused even increasing Elavil dosage can help.

I guess may be getting Oximeter like Mark mentioned may be one way to find out.