Bosch & Falah in a critic of Harrington and Zajonc (2003) mention Swami Rama and the Menninger Foundation and to declare that:

In 1970 Swami Rama, yogui Hindu, has studied extensively in the Menninger Foundation where it demonstrated a great variety of extreme abilities, including the state of death volunteer-like of the physiological halting called Yoga Nidra (Anand, Chhina and Singh, 1961, Kasamatsu and Hirai, 1969, Boyd, 1995) [4].

The Dr. Kumar Kamakhya in 2006 granted by Ph. D. degree by the Dr. A. PJ Abdul Kalam (President of India) by “its work psico-physiological like changes related to Yoga Nidra”. It observed the effects of six months of Yoga Nidra in some physiological, hematológicas ones and some psychological parameters of the medical instructors and were with a significant change in the parameters before mentioned. One of the investigations published titleholder “Study on the impact on stress and the anxiety through Yoga Nidra, Magazine of the traditional knowledge, bowl. 7 n º 3 ". (Published by NISCAIR)
Yoga Nidra is often associated with the respiriana movement.