My DS9 is not diagnosed with anything....I don't even consider him to have sensory processing *disorder* but rather to have sensory differences. He is definitely highly sensitive to tactile input and also a sensory seeker.
When he is bored, sometimes when he is extremely focused and sometimes when excited he will make weird noises, repetitive movements and even head "bang" (although he isn't doing it hard enough to hurt himself). Just tonight while playing Tri-ominos he was making strange noises and lots of movement while thinking and studying the pieces during his turn.
