This is an excerpt from the Russian Sleep Experiment article:

He pointed his gun at the remaining subject, still restrained to a bed as the remaining members of the medical and research team fled the room. "I won't be locked in here with these things! Not with you!" he screamed at the man strapped to the table. "WHAT ARE YOU?" he demanded. "I must know!"

The subject smiled.

"Have you forgotten so easily?" The subject asked. "We are you. We are the madness that lurks within you all, begging to be free at every moment in your deepest animal mind. We are what you hide from in your beds every night. We are what you sedate into silence and paralysis when you go to the nocturnal haven where we cannot tread."

Nightmares much?