Loss of consciousness due to the interruption of breathing and consequent anoxia.
Loss of consciousness due to the body's inability to deliver oxygen to its tissues, either by the breathing of air lacking oxygen or by the inability of the blood to carry oxygen.
A feeling of extreme anxiety or suffocation experienced during sleep; Sleep paralysis.
Any bad, miserable, difficult or terrifying situation or experience that arouses anxiety, terror, agony or great displeasure.
A very bad or frightening dream.
To have a nightmare.