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.
unhappiness, woe
(usually in plural) An instance or cause of unhappiness.
To feel grief over; to mourn, regret.
To feel or express grief.