There is evidence that daylight exposure can affect post-operative outcomes in patients and, consequently, that daylight should be a consideration in hospital design. Ulrich (1984) reported that hospital patients with a view of green spaces, as opposed to those with a view of a blank brick wall, recovered more quickly from surgery and required less post-operative pain medication. Beauchemin and Hays (1998) found that patients on the sunnier side of a cardiac intensive care ward showed lower mortality rates than those on the less-sunny side. Another study deter- mined that sunlight exposure was associated with both improved subjective assessment of the patients and also reduced levels of analgesic medication routinely administered to control post-operative pain (Walch et al., 2005). The importance of the amount of daylight in a patient’s room indicates an impact on patients’ length of stay; coronary artery bypass graft surgery patients’ length of stay in hospital was reduced by 7.3 hours per 100 lx increase of daylight (Joarder and Price, 2013).