Depends on genetics, past attempts, there’s not a straight precent there’s a lot of factors.
Sometimes nightmares happen because of what happened on the day before you went to sleep, you might’ve been stressed, you watched a horror movie, or you might have been really scared of something, nightmares also happen because you thought about a lot of creepy things or things that would frighten you before you fell asleep.
Idk.. I am guessing so she won't get fired but don't listen to me
Carbohydrates and Vitamin B complex