Is it normal to have nightmares sometimes?

Dreams or nightmares are, well...sometimes unormal and sometimes normal. You know, sometimes, people may believe that dreams are sending you small messages. If you dream that you are falling, that means you are depressed or sad/mad/angry at someone. If you dream that you are flying an airplane, very steadily, and you know exactly how to drive, (even though you don't know/have not learned.) means that you are happy, and driving away from all the bad things that you have encountered. Sometimes, people even dream of thing that they have forgotten. These dreams are called 'Reminder Dreams'. Reminder dreams happen very rarely, and only happen if you have forgotten something, (Sometimes, even when you have forgotten something, you wouldn't have that dream.) And, I ensure you, don't be afraid when you have nightmares.And remember, every dream means something. If there are questions you want to ask me, you can.