The caterpillars of pink-spotted hawk moths occur in MANY variations of color and markings, but the one marking they all have in common is vertical stripes on the head, like yours. Most of them also have the marking on the top of the body near the head like yours. I can find no other sphinx moth cats with that combination of markings, so that must be what yours is.

Congratulations! I've seen these beautiful moths nectaring on my moon flowers when I lived in the country, but never found a caterpillar -

My book also calls them the sweet potato moth, because they use sweet potatoes as host plant, also morning glories. MGs grow in an area of my neighbor's yard behind a brick 'shed' that adjoins my yard - think I'll go look for caterpillars!

Sherry