Nightmaring 

Nightmaring: Bottling up your rage/fear/sadness/regret/etc. to the point where you explode, doing something that you would never normally do.

Luna, in becoming Nightmare Moon, was one of the first recorded examples of Nightmaring

Nightmaring by Clear Quill August 6, 2011

Nightmaring 

When you nightmare

I was nightmaring last night

Nightmaring by FierceOfHyrule April 1, 2021

Day-Nightmaring 

It's like day-dreaming, but having nightmares instead of dreams.

'What's wrong?' Said the concerned friend. 'Just day-dreaming' she said, obviously lying. 'More like day-nightmaring' The friend said, unconvinced

Day-Nightmaring by (ง'̀-'́)ง Fight me bish! May 23, 2021

Day Nightmaring 

Similar to daydreaming, but instead of thinking about warm happy things you’re probably imagining a dark torture room filled with Eastern European guys named Surgei, or that one date you went on where the guy flossed in the movie theater.

“Snap out of it!”

“Sorry, I watched Saw 3 this weekend and keep Day Nightmaring.”

Day Nightmaring by itspoeticjustice July 17, 2016

Nightmario 

A portmanteau of "nightmare" and "scenario." It's the worst possible outcome of an already bad situation.

Getting dumped while Boston was down 7-1 was bad, but having the kiss cam catch it all was a total nightmario.

Nightmario by gis_in_my November 7, 2011

nightmorning 

When one wakes too early in the morning, in which it is still dark outside.

Gabriel woke up at 4:00 A.M. Therefore he was late, because he still thought it was nighttime. This is when nightmorning can confuse someone while they are sleeping.

nightmorning by Menbugme June 11, 2009

Nightmaren

A human-like creature that lives in dreams. Nightmaren can fly and do all sorts of acrobats.

That Nightmaren, NiGHTS, is so cool!

Nightmaren by Speedlight July 2, 2003