What's the point? That's basically possession. If you enter ones dreams. You enter their mind. Since the dream goes along based on THEIR brain. You simply can't control it. But guaranteed they will kick you out.
So not what I wanted to hear! There just must be a way!!! At least to give someone nightmares about you, or things like this! It is very important for me to do this, and I've searched alot and found nothing or stupid things!
I'm sorry that's not what you wanted to hear. But, life is like that sometimes. Welcome to reality. And now, knowing that you want to cause nightmares in someone else, even if there was I wouldn't tell you.
If you really want to cause nightmares, just use psychological tricks on them to cause this. There are ways to hypnotise the tired or weak mind to dream of what you want it to. If you're seriously this obsessed with it, why not try a basic technique of that nature?
You can but through AP, also if you have a friend who can AP you can meet each other while your Astral projecting. There's other things you can do while you AP if you have a AP buddy. The thing I am going to ask is why would you want to invade a person dream? You shouldn't do anything without asking a person precession 1st cus basically it's like rape. You shouldn't take anything from anyone. I have a spell to get some to dream about you but not to invade someone's dream. I don't give out spells anyway but I wouldn't condone this kind of behavior. If you want to meet someone in Astral realm then do with there permission or what ever else it must be with consent. Without consent then it's wrong in my eyes.
The point, I would think, of entering a person's dream is to learn about them or help them through something. Deciding to give someone a nightmare is an abhorrent goal that should not be attempted, I doubt anything would even come of it since people have nightmares all the time and go about their lives anyway. To wish bad dreams upon someone is to wish for their suffering, to do such a thing with magic puts yourself at just as great a risk as them. People will tell you about karma or the three-fold law, but one thing I know for sure is that any magic done out of hatred is far more dangerous than you realize. The one in danger is not even your target, but you and your loved ones. To fuel your magic with hate is to give into your hate, and to give into your hate is to invite it to consume and destroy everything you cherish.