The wealth of information contained in light and sound is staggering, as can be seen in 8th century Asian Ink drawings and the vibrating pollination technique used by the bumblebee. And the ways we process light and sound are equally complex, it turns out–join us on an exploration of human auditory and visual systems, as we talk about Night Shift, fire alarms, and medical applications of light and sound. We close by introducing ‘Hypnos’: a device we are currently developing for circadian enhancement.