The travellers

When Niccolo turned 18 he started to see creatures from a different world. It invaded his sleep and even his waking life. He tried to block the images but to no avail. He just learned to live with it. One day a mysterious new room mate arrived. He seems normal at first even friendly but as he got to know him the images became clearer and scarier. Even he can no longer tell which is real and which is imagined.