A woman in the care of the author 40 years ago was reported to have been Blood Pressure Monitors sleeping for 2 days.We treated her condition as conversion hysteria.Her private psychiatrist was the renowned R.D.Laing; he was unhappy with our line of management, on the grounds of the arbitrariness of the diagnosis, the labelling of the woman with a diagnosis of hysteria and the treatment of the patient without her consent.
In retrospect, I wonder if she was in a state of yogic Handle sleep (yoga nidra).