VitalSky is a personalized light therapy system designed to support patients’ circadian, or sleep-wake, rhythm to help reduce delirium in intensive-care patients. The program simulates the natural progression of daylight using a spectrum of glare-free white light provided by a large, luminous LED ceiling. The system also provides workplace lighting and a portable user interface with the option of playing calming nature scenes in full-color, soft-focus video. The company plans to add cognitive training to the system. Royal Philips and University of Twente collaborated on the research for this product, which has been brought to market in april 2019.