A problem, or unpleasant or painful situation or person that you have to accept and deal with, although you find it very difficult, or it causes trouble or worry for you over a long period of time.
Any bad, miserable, difficult or terrifying situation or experience that arouses anxiety, terror, agony or great displeasure.
A very bad or frightening dream.
A feeling of extreme anxiety or suffocation experienced during sleep; Sleep paralysis.
To have a nightmare.