Light is the most important environmental factor affecting circadian rhythmicity, and research over several decades suggests that manipulation of light and dark exposure may improve clinical outcomes. However, there is uncertainty about the potential extent or magnitude of any improvements. In this study, Håvard Kallestad and colleagues examine the effects of evening light modifications in an acute psychiatric unit. By implementing specific lighting interventions, a blue-depleted evening light environment versus a standard light environment, the authors sought to provide a non-pharmacological approach to improving patient care in psychiatric settings.

Image Credit: Dmytro Kormylets,Pexels