Adult Night Terrors

First the build up:
For the last few years I've notices my brother having very vivid nightmares or terrors...ive personally witnessed him falling asleep laying on the floor watching a movie....and waking up later with all electronics off, scared to death because he thought he saw a ghost...or he saw a snake coming at him or eating our dog...this is just one example...another example is waking up convinced demons are coming after him...and that hes covered in flys, prompting him to flee his bead and run into a wall.

Ive heard from my mother that our grandmother experiences these as well...so this discounts any worries i had about him being on hardcore hallucinogens(sp) or other drugs.

Now for the question:
are the episodes a possible symptom for something else?
what actions can we take without much financial means to help fix this issue?

thanks L.