what can cause nightmares?

Probably things that happened between someone really close or a traumatic event. Or just fear.
 
nightmares can come from previous movies you've seen that are scary...or something that happened in your past that you didn't like and you dreamed about it. i really don't know why people have nightmares...i just know dreams send messages
 
well dreams are affected by your subconcious thoughts. so if you are worried about something, or dread something that can be a cause of a bad dream. also, some tests have shown that things happening around you while your sleeping can affect your dreams. so if a scary show is on the tv or something of that sort could cause a bad dream.
if you want more info you should check out this page(:
http://www.here-be-dreams.com/nightmares.html
 
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