"Yogis have known since ancient times that Yoga Nidra soothes the nerves and calms the mind; for centuries they have used it for health and meditation purposes. Today doctors acknowledge the link between nervous disorders, stress, and physical disease and often prescribe relaxation for their patients. Its effectiveness is backed up by scientific research showing that deep relaxation oxygenates the body's cells fully and efficiently, which helps combat infection, cancer, high blood pressure, and many other diseases," says Wai Lana, the world's most-watched yoga teacher and host of the internationally aired TV series Wai Lana Yoga."The stress we experience takes its toll on our bodies. Although it is experienced first in the mind, it often manifests in the body," commented Wai Lana. "In milder cases, it turns up as a stiff neck or tight shoulders, which may lead to headaches and back pain. Stress often causes insomnia, which leads to further stress and fatigue. When we are under this type of stress, our immune system becomes depressed and we become more susceptible to viruses and disease. Stress can also cause digestive disorders. When stress is present over a long period, it can lead to more serious conditions, such as high blood pressure. It's a risk factor for heart disease and can lead to depression and alcohol and drug abuse. Research shows that simple stress-reducing techniques, if performed daily, can prevent the longer-term debilitating effects of unmanaged stress." Information provided by www.wailana.com. Wai Lana is the foremost authority on yoga, hosting the world's most-watched show, Wai Lana Yoga, which airs on five continents, including nationally in the U.S. on PBS, cable and satellite.