That sir, is false. Everyone has dreams, and you don't have to have extreme emotions for better dream recall. People who can't remember their dreams, like myself, sleep deeply. Which is good for the body obviously. If you do remember the dreams that means you wasn't sleeping deep enough. And if that happens a lot, it means your body can't get enough rest. If your body can't get enough rest, you will be tired. If you are tired, you can't be at the top during the day. If you can't be at the top during the day, your marks will go down. If your marks go down, your teachers won't like you. If the teachers don't like you, they will do anything to make your marks worse.... Anyway, you get the idea. xD
(The first bit was true though.)