There has been quite a lot written about the relevance of sleep paralysis to the question of alien abductions. In Australia one of the best articles written in recent years is one by former UFO researcher Keith Basterfield and is to be found here.
Less has been written on the possible application of sleep paralysis research and the paranormal. However, the new book by Australian, Louis Proud, titled "Dark Intrusions" presents an interesting read. Find out more about the book