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अनन्तासन (Sanskrit, Anantasana) Also: Sleeping Vishnu Pose, Vishnu's Couch Pose, Eternal One's Pose, Side-Reclining Leg Lift

Lie on side. The head is supported with one hand, the upper arm on the ground on that side; the other hand and leg are stretched straight up, the fingers grasping the big toe of the raised foot. The supporting arm, body, and lower leg are in a straight line.

https://en.wikipedia.org/wiki/Anantasana