What causes nightmares?

Most people experience nightmares on occasion. According to the sleep health foundation, only 2.5 to 10 percent of adults experience nightmares, yet up to 90% of those with PTSD have reported “disturbing dreams with some degree of resemblance to the actual traumatic event,” But what really causes nightmares?
via FOX NEWS http://bit.ly/2A7F5Ek
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