It really depends on what you are dreaming. So since I don't have any examples I'll give it a shot and try to answer to the best of my knowledge.
If you are having nightmares- than no it's not normal or something you have to keep. I would pray over my sleep- and pray for sweet sleep, and at the same time bind up all night attacks,terrors in Jesus name.This worked for my daughter who was having really really bad dreams- plus we had to get out anything linked to the occult because it really invites those spirits into one's house.
Now if you are having like dreams/visions of like warnings of up coming events than you will need to pray against all calamity in Jesus name. God gives us dreams, visions and such to warn his people.
Now satan can cause bad terrifying dreams that will induce extreme fear and panic.
Lately the body of Christ have been getting dreams and visions so we can pray for those involved in the tragic upcoming events to be saved, and for God to have mercy on them and save them from the coming destruction & etc- what so interesting about this is all the dreams and visions line up and agree with each other even though they came from different people at different places and such.
So is it an attack or a warning?
Well this is all that I can think of- so if you can clarify on what is happening and how long it's been going on I would love to know & help in whatever way.Also I will pray for you in Jesus name.