We might as well face the facts: we have become an indoor species, light years away from the life-affirming bright day and dark night cycle that our bodies and brains evolved to thrive in. The devastating consequences for our mental and physical health – and that of the natural world – are only now coming to light. Discover three simple tips inspired by NASA’s billion-dollar research programme to create a healthier, happier and more sustainable future for all. Dr Shelley James is an international expert on light and health, a member of the International WELL Building Standard Advisory Board and Artist in Residence at the Bristol Eye Hospital. She is also a trained glass artist, electrician and lighting designer. This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at https://www.ted.com/tedx