A human-like creature that lives in dreams. Nightmaren can fly and do all sorts of acrobats.
That Nightmaren, NiGHTS, is so cool!
by Speedlight July 3, 2003
The word nightmaren is a play on the word nightmare. A nightmaren is a frightening ginger that reoccurs in one's dreams.

Namesake of a student at Charles R. Drew elementary school. She actually had a soul.
Setting: Eastern Middle School

Eric: Oh my gosh you remember at Drew elementary that girl named maren?

Josh: Oh yeah I do, I got nightmarens for weeks after meeting her for the first time

Eric: But at least she is not a Ms. Hawe

Josh: Yeah, maybe she didn't like boys.
by 7th grader at Eastern March 7, 2014