dreams is a filing system of y brain...you wake up refreshed...nightmares is jst ones worst fears-blown out of proportion...viewed in a way your filing system want to make you aware of.
Yes it does sumt happen but u cant tak precautions cuz u dnt know wen it wil happen.Most of da time u realise da dream is happening wen it happens and wen its2late2stop it.
Dreams r expressions of our deepest & darkest desires. If we take the negativity from our dreams in2 our evryday lives we r going 2 b surroundin ourselves in negativity.