I get too many nightmares. Sometimes I have been choked and can't shout or open my eyes. Sometimes I find myself in battle field. Sometimes I find myself killed in dreams. Most of the times I find like I can't stand or walk and become paralyzed. Last night I saw one strange animal suddenly attacked me on my neck and I wake up scared. Is there any meaning on dreams and nightmares? Is there something I can do to reduce these nightmares?