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 temporary cessation of breathing and consciousness resembling death; often the result of asphyxia.
The deliberate slowing of the body's functions, sometimes by the use of cryonics, on long interstellar journeys.