আপনি must pray to God to help আপনি have good dreams and a peaceful sleep. Remember, He made you, and He is the only one who can actually control your dreams. So ask Him, and He will surely help you.
"when আপনি lie down, আপনি will not be afraid; when আপনি lie down, your sleep will be sweet." (Proverbs 3:24)
depends if God অথবা the devil অথবা anything relating to soemthing important in the bible then it's a sign but if it's just a bad dream then it's normal আপনি can't help what আপনি dream
Everything but your nervous, respiratory, and circulatory system sleeps at night. I've heard that there's someone called a "brain guard" and at nightime he falls asleep, so all the things in your brain get mixed up and become dreams. I don't really believe it. Sometimes God can send a warning. But if আপনি think it doesn't really mean anything, don't mind it.
If আপনি do bad things leading to the nightmare well, yes. But if আপনি do nothing and have a bad dream, it's kinda a temptation from the devil. Thanks for reading.