Yoga Nidra means Yogic Sleep. It is a state of conscious Deep Sleep. In Meditation, you remain in the Waking state of consciousness, and gently focus the mind, while allowing thought patterns, emotions, sensations, and images to arise and go on. However, in Yoga Nidra, you leave the Waking state, go past the Dreaming state, and go to Deep Sleep, yet remain awake. While Yoga Nidra is very relaxing, it is also used by Yogis to purify the Samskaras, the deep impressions that are the driving force behind Karma. The form of Yoga Nidra described in this article can be called Advanced Yoga Nidra. Unfortunately, almost any guided practice that brings a modicum of relaxation is now called Yoga Nidra. Therefore, it is now virtually essential that we use another term, such as Authentic Yoga Nidra, Traditional Yoga Nidra, or Advanced Yoga Nidra.