Dear Wade, have you had the chance to watch a TV show called Medium?
the things that your girlfriend is seeing is very similar to this show, except that a positive solution to the mystery is always presented by the end.
but its the same kind of graphic detail she saw with the dead boy in the bed. I do think she is developing with this sensitivity to tune into astral areas and sleep time is how she does it. You are also sensitive to slip into her dream world. You both may be able to escort or retrieve these that are seen in dream or other altered states, into the light, or if you prefer, focus 27 by first getting over the shock of the fact that an astral world does exist. sometimes it's true, that people who die suddenly need a little assist to be moving on. but first we can remind them that the light is there if they will turn their attention to it. They cannot hurt you. the nightmares are because your girlfriend merges her awareness into someone else's drama and loses her hold on her own individuality and choices. understandable..I've done that before too. she suffers for what she sees.
you two should do some brush up study on how to retrieve..it's not that difficult and the nightmares will cease. it also involves the use of visualization and imagination. I know you can do it! it's more about caring about others than anything intellectual, to get them moving on and away from the terror of being disassociated from physical body but still know that you're alive, yet no one is acknowledging your presence, so you must be dead! is the reason to do retrievals with PUL, seems to be the fastest motivation for bringing the light to the situation.

Tell your girlfriend to engage conversation with any spirit she finds next to her..ask it questions and with the intention to gently turn it into the direction of the light. imagine a portal, or a guide to assist you/her. you need only call for that. do not fear. no harm will come to you.
love, alysia