 A study of certain aspects of motion sickness among medical transport attendants showed that the onset of the sopite syndrome is likely to occur independently of the mode of transportation; little difference was observed in the frequency of sopite symptoms for ground transport compared to air transport.Also, the length of time exposed to vehicular motion did not appear to affect the occurrence (or lack thereof) or severity of the sopite syndrome.No difference was observed in the incidence of the sopite syndrome for men versus women.