How can technology help us understand ourselves better? In order to measure the physiological arousal of children with sensory challenges such as ASD and ADHD, tools were developed to help children understand and control what makes them overexcited. Using iCalm hardware, children in therapy sessions measured their arousal while eating, throwing tantrums, playing in ball pits, and making challenging choices. Beyond progressive findings in the field of occupational therapy, this research is a basis for bio-information technology: tools to help children, their parents, and their teachers better understand what is going on in their bodies in a comfortable, affordable, and adaptable way. With future work, technology will be developed to help children understand and control their own internal states. In addition, this project will go beyond children�s therapy�helping adults in various settings including business and home life.