im not an expert but , i think everyone has a fear of nightmares.
Do you mean what is the name of the phobia for the fear of nightmares?
because of fear
Oneirophobia
It can cause you to have nightmares
Captain Ahab suffered from a deep fear of Moby Dick, the white whale that had previously taken his leg. His obsession with seeking revenge against Moby Dick consumed him and led to his ultimate downfall.
Both children and adults can have bad dreams or nightmares caused by guilt over bad behavior. Nightmares might also be triggered by fear of punishment or retribution.
The littluns are terrified of the "beastie" on the island, which they believe is a supernatural monster. They have nightmares about this beastie coming to get them, causing them great fear and distress.
It is said that Botticelli feared marriage so much that he had recurring nightmares about it. That is the only fear I've heard of.
The fear darkness goes by many names but the most common seem to be Nyctophobia and Scotophobia. The fear of dreams is known as Oneirophobia.Nyctophobia and Scotophobia are terms relating to fear of the dark.
Freddy is able to kill those that have a fear of him. That gives him the ability to enter their nightmares and do as he wishes.
Fear is the brain's response to something (real or not) that seems dangerous or scary. Nightmares cause fear, but nightmares are not real and cannot really hurt you. A fear can be legitimate, or illogical. A good example is when a parent screams because they see a lady bug-- their child learns to scream when they see a lady bug-- but a lady bug insect will not hurt any person.
Dreams can become nightmares when they take a dark or disturbing turn. This can be due to fears, anxieties, or unresolved issues that are brought to the surface during sleep. Nightmares can be unsettling and may cause distress or fear upon waking up.