The palm-size sensor developed by the team of TANICHI Masako at Osaka University can be applied in the form of a cooling sheet on the forehead of a test person. It not only allows to measure sleep cycles but also can be used for the measurement of emotional states, stress etc. It also can be applied to children and even babies. The output can be measured in real-time, e. g., on an iPhone.
JST news release, August 16, 2016