Yoga Nidra is a meditative yogic practice. It is a state on borderline of sleep and wake fullness. Its nothing but Perfect Relaxation.You have to follow the instructions given under the sub heading Prerequisites, Preparation and Preposition.

This practice has been Designed by Paramhansa Swami Satyanand Saraswati, the founder of the Institute " Bihar School Of Yoga" at Munger, Bihar, India.

An asana is a body posture, originally and still a general term for a sitting meditation pose, and later extended in hatha yoga and modern yoga as exercise, to any type of pose or position, adding reclining, standing, inverted, twisting, and balancing poses.