The Demonic Dream
A demonic dream takes a different form, Rav Yehuda Fatiya teaches. During it one feels great agitation, and may feel a weight on his chest as if someone is sitting on him. The dream images are confusing and blurry, and no clear message is received. One wakes with feelings of anxiety and panic. He feels an inner conviction toward a certain course of action, yet no logical or permissible means to carry it out presents itself. The person is then led to believe that his family, friends or community are holding back from him some form of unmanifest destiny. The forces of evil return in dreams to confuse him further and make him suspicious of those around him. Eventually paranoia sets in, followed by schizophrenia. All this occurs because the person opened himself to foreign outside influences without first being on a proper level of kedusha (holiness) to defend himself.
Source: Minchas Yehuda