Yoga Poses for a Better Sleep: these poses are designed to bring your senses inward and to stretch the areas that are most prone to tension, so your mind and body will feel relaxed and ready for sweet slumber.
This is an example of hyperextended knees. Its bad. You need to get more on center of her feel with balance dispersed on all four corners of her feet. Bend at the knees a little and lift up on the quads instead of punching the knees back.