She had a recurring 'nightmare' [=she had the same bad dream many times] about losing her job.
Losing a child is every parent's 'worst nightmare'. [=the thing every parent fears most]
Mommy, I had a really scary 'nightmare'.
(..) No space to think in that broom cupboard. Is it safe for you to be here? Extradition between France and the United States... ...is a bureaucratic nightmare, you know that. I think they might find a way to make it work in your case. Look, I, uh, brought these for you to give (..)2010 Inception