1) Yes there are ghosts but not in the traditional sense. Instead of person shaped ghosts wandering about, they're more like emotional imprints. Think wispy spirits that are formed from strong sentiments left by the deceased. So those who are attuned to the dead and spirits like that can sense them, sense the emotions, and may even hear the voice, but they cannot be communicated with (at least under normal circumstances—events can change this).
2) It is also possible to broadcast a dream since that is all part of the mind and can induce powerful enough emotions for it to be inadvertently sent out to others.
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1) Yes there are ghosts but not in the traditional sense. Instead of person shaped ghosts wandering about, they're more like emotional imprints. Think wispy spirits that are formed from strong sentiments left by the deceased. So those who are attuned to the dead and spirits like that can sense them, sense the emotions, and may even hear the voice, but they cannot be communicated with (at least under normal circumstances—events can change this).
2) It is also possible to broadcast a dream since that is all part of the mind and can induce powerful enough emotions for it to be inadvertently sent out to others.