What does Alien Nightmare mean?

Alien Nightmare meaning in Urban Dictionary

The Alien Nightmare is an induced fantasy state when one is given a sleep help eg Advil PM, Tylenol PM, or NyQuil and a horror / thriller movie (in other words. Alien 3) is turned on at complete volume therefore inducing a literal Alien Nightmare or a horrific fantasy that now resting individual is incompetent at waking from.