Yoga Nidra, also known as 'psychic sleep' is a deep relaxation practice from the Indian yoga tradition. We often equate 'relaxation' with activities like listening to music or walking in nature, or simply having a quiet time. Relaxation is something we do naturally, and we don't need any special training or techniques. However, deep relaxation is something very different. It quietens your mind and releases physical tension in your body. In a state of deep relaxation, your heartbeat and breathing slow down, and your body and mind become deeply calm.