savasana,
Shavasana (Sanskrit: शवासन; IAST: śavāsana), Corpse Pose, or Mritasana, is an asana in hatha yoga and modern yoga as exercise, often used for relaxation at the end of a session. It is the usual pose for the practice of yoga nidra meditation, and is an important pose in Restorative Yoga.

Shavasana
Etymology and origins
The name comes from the Sanskrit words शव Śava, "corpse" and आसन Āsana, "posture" or "seat". The alternative name Mritasana is from Sanskrit मृत mṛta, "death".
The earliest mention of this asana is in the 15th century Hatha Yoga Pradipika 1.32, which states in the context of a medieval belief system that "lying down on the ground supine, like a corpse, is called Shavasana. It eliminates tiredness and promotes calmness of the mind."
