You might think this photo is a repeat, but it is not. Dave just really enjoys this pose. While he is always on the lookout for newer and better napping techniques, he also subscribes to the idea that "if it ain't broke, don't fix it." He tries to strike a balance between staying in his comfort zone and taking chances on new ideas. That's why you might often see Dave doing the exact same thing several times. It's not that he is uncreative or lazy, he just wants to enjoy the fruits of his labor. All that work developing new techniques has to pay off some time. This is that time.