crazy sleeper strikes again

So, I've posted before on my son and the crazy places he falls asleep. Well today we have a new one. In the tub! We had a pretty rough night, not uncommon in our home. I give the kids a bath at the same time, always in the morning. Taylor was already out and dressed, and Tyson was laying down, "floating" and getting the shampoo out of his hair. I was brushing my teeth and yelling to Tyson that he needed to hurry up when what do I hear? Snoring!!! I look over and this is what I find. So I finish rinsing his hair out, the child continues to snore. The only thing that woke him up was letting the water out.
I wish I had taken a picture of the half an hour tantrum that ensued after waking him up, but I didn't. The boy is awful to get to sleep and awful to wake up. What is a mother to do?