Ananda Balasana ~ Happy Baby
Also called Dead Bug pose.
Think right angles: 90 degrees thighs and shins and 90 degrees shin and foot.
A pose for fatigue that will stretch the inner groin, hips and low back. Surrender to release. Eventually the feet will go behind the head. When this happens extend your arms over your thighs, clasp your hands behind your back, rest your occipital bone on your metatarsals and sleep like a blissful yogi ;)