Comment: If you have not come across the work of Dr Felicitas D Goodman, please check this site out. The site provides resources related to Ecstatic trance positions and also Dr Goodman’s cross cultural studies on “speaking in tongues”
Ecstatic Trance Postures (ETP): Ancient Technique for Safe, Natural Physiological Shift into Direct Experience of the Eternal Now and Ancestral Wisdom.”