From the ever-reliable Wikipedia:
So, if you ever need an excuse...
Quote:This phenomenon is well known among the Hmong people of Laos, who ascribe these deaths to a malign spirit, dab tsuam (pronounced "da cho"), said to take the form of a jealous woman. Hmong men may even go to sleep dressed as women so as to avoid the attentions of this spirit.
So, if you ever need an excuse...