Hi, first off, let me say that I feel for you, both of my boys also were soothed best with rocking, bouncing, and swinging motions. They were never waking as often as your son, but did wake often throughout the night. The constant bouncing and rocking can really wear on your body, especially when you don't get enough sleep for yourself. I am far from an expert, and my children, now 2 and 4 have not officially been diagnosed with spd, but both obviously experience sensory issues. They are both diagnosed autistic and with fragile x syndrome. Just an idea though, have you considered an "outdoor" infant/toddler swing? These can be attached directly to eye bolts that can be put most anywhere, as long as they are put into a ceiling joist. We have one on our porch, and in the past, have considered putting it inside. They aren't as ideal as an infant swing, as you have to push it yourself, but the possibility of putting it near a place where you can relax is an option, also you can tie a rope to the swing, and use the rope to pull when the child slows, or wakes, leaving the possibility of you remaining sitting and relaxed. To this day, swinging is one of the most relaxing activities for both my boys. Good luck....