I tried sitting down with my iPad flat on the table but my back got bent worse than the Hunchback of Notre Dame.
Next I tried sitting on the bed, but again I was crouching forward, and almost fell forward especially during the boring parts of the movie and my arms got tired holding the iPad.
Finally I found the perfect position.
Rest your head on the pillow, your legs bent, iPad resting on your legs and your hands holding it steady. Careful not to doze off.