Much scientific research has been done on (1) sleep and (2) yoga and related practices of relaxation and meditation methods. One of the neglected areas of research is what is known in the yoga circles as yoga-nidra, that is, yoga-sleep.
The Himalayan Mountains have been the home of sages for millennia. These great sages have lived and passed on knowledge of the yogic teachings to disciples who then became masters passing on the teachings in an unbroken lineage since the Vedic period. Twelve hundred years ago Shankaracharya organized his teaching into five centers of the Himalayan Tradition. As one of those five, our tradition is the Bharati lineage.