https://www.statnews.com/2021/07/28/covid-shows-barring-bedside-visitors-deprives-patients-of-best-care/

“A growing body of evidence supports the theory that bedside visitors offer not only comfort, but true clinical value. As experts on their loved ones, they can provide important details that may be missing from health records, and can clock subtle changes in behavior that may precede adverse medical complications. Visitors can calm agitated patients with a touch of the hand and reassure them with a word. They fluff pillows, fetch ice, clip fingernails, brush hair, and bring in favorite foods that might convince someone to eat for the first time in a long time.”