One stimulation we have added to our home to stave off his constant sensory deprivation is a rice bucket. He sits in the bucket filled with 50 pounds of rice and plays with toys or spoons while listening to a book on tape or during family chapter book time. He is retaining more and is much less disruptive. It is a win-win for everyone. He can also sit in the rice with a clipboard and do his math or grammar page. Being in the rice gives many of the pressure points of his body input and helps him feel more centered.
Interestingly, he feels a bit uncomfortable in what we would call a "just right" state. He is not used to it, so we can see him trying to rev his engine to what he thinks is normal by spinning or leaping about. When this happens, we have to give him more sensory input to keep grounding him. This is exhausting for his parents, since at this time he needs input every 15 to 20 minutes. However, every minute we can keep him in the proper just right state will become more normal to him. In time he will learn to desire the normal, just right state.