Dreamstorms (GAP)

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One of the strangest types of psychic wind is fueled by the mental energy of dreams rather than conscious thought. These dreamstorms are rare, but when they blow through the Astral, interesting things happen on both the Astral and the planes that it borders. The energies of this kind of storm affect only the sleeping mind. When it passes through the Astral, anyone in its path that is asleep suddenly finds himself dreaming someone else's dream. His mind is flooded with images probably completely alien to him. He wakes without feeling rested, penalized the whole next day by a -1 to all die rolls. More severely, however, he must make a saving throw versus spell or react (upon wakening) as though by a fear spell, fleeing in a random direction.
Lasting effects include a phobia regarding whatever was dreamed about. Some sods have been peery forever after that someone else might be seeing their dreams. Such effects must be worked out by the DM. 
Dreamstorms can have other effects, too. A whole group of people sleeping during a dreamstorm can have the same dream. This often results in mass hysteria and widespread paranoia. People affected often attribute such occurrences to omens or purposeful sendings, often interpreting the dreams to forecast some coming doom. (Why it's always doom and not something good is any basher's guess.)
Dreamstorms are the only known type of psychic wind that can affect folks not on the Astral Plane.