Is that normal after brain injury to have no dreams?

Depends on YOU: It can go all ways. I've had traumatic brain injury patients (TBI) who've had changes in their dream patterns to NO dreams where once they had some, patients who have developed BAD dreams after TBI. I attribute that to Post traumatic Stress Disorder (PTSD), & then, had patients who've had no change. I don't think we know what's up with TBI & altered dreamstates following TBI. Keep a log!