King's College Hospital rooftop garden and MiEye light sensor target ICU delirium through daylight exposure

King's College Hospital converted a rooftop with charity funding so patients from 60 intensive care beds can go outdoors with full life support, aiming to ease ICU delirium and hallucinations, which are linked to lack of a bright-day, dark-night rhythm. At George Hospital, stroke and neurosurgery patients use a similar garden set up by the John King Brain Tumor Foundation. MedCram's review cites clinical observations that adequate daylight can cut ICU stays by about 30%, and that 15 minutes of daily light for 7 days shortened stays in a COVID study, while the MiEye sensor records light exposure and sleep diaries for circadian phase and amplitude modeling.