Once you are comfortable with basic sleeping, you may wish to move on to more difficult positions, as demonstrated here by Dizzy the Frenchie. Caution: Dizzy is a professional; do not attempt these maneuvers without training and supervision.
First, the “Frog Leg Layabout”:
And now, the difficult but elegant “Double Cross”:
From Team Dizzy: Photographer/Sender-inner: Carolyn M., Owner/Trainer: Erin C.