Yoga Nidra is a type of meditation, where you want to lie down comfortably, preferably with some pillows and blankets. The purpose of this practice is to relax deeply both mentally and physically. While lying down, just listen to the voice guiding you thought the body. Keep your mind awake and allow the body to fall into deep relaxation.
This meditation practice is a nice one to add on to your daily yoga asana practice or finishing the day with to calm the mind before bedtime. Relax with awareness, remain effortless and consciously relax the body and the mind.