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Acronym for Space Adaptation Syndrome. A type of temporary sickness caused by exposure to a weightless environment. It is said that the cause of SAS is a vestibular disorder, whereby the vestibular system undergoes a paralysis, causing one to lose one's sense of balance. Symptoms include dizziness, cold sweats, vomiting, headache, fatigue, and, in particular, a false feeling of falling over that does not occur in ordinary motion sickness. The most effective treatment is an intramuscular promethazine injection.
Conversely, the bodily changes experienced when moving from a zero G environment to a 1G environment are collectively called Earth Adaptation Syndrome.