Yoga Nidra is a type of meditation where you 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, listen to the voice guiding you through the body. Keep your mind awake and let the body fall into deep relaxation.
This meditation is a good one to add to your daily asana practice, or to finish the day with to calm the mind before bedtime. Relax with awareness and let the body and the mind relax.