Yes I know what you mean, it doesn't mean you are going psychotic. They are fairly common and not indicative of any psychotic disorder. From what I've read they are more related to sleep disorders than any kind of mental illness. 
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"Much like wind blowing through hollowed cemetery grounds, we all circulate within this void of reality in search of something more profound. Hopes and Dreams fuel our will to live, projecting our desires into the universe and awaiting what it gives. Throughout life's journeys you will encounter Saints as well as the Heartless, but remember, in order to Appreciate the Light, one Must spend time in Darkness." ~ Prozak
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