Artificial Light at Night and Type 2 Diabetes: Review
Summary
This systematic review examines evidence linking artificial light at night (ALAN) to type 2 diabetes risk. Studies in both general and working populations show that higher nighttime light exposure—whether from outdoor sources, workplace lighting, or personal devices—is associated with disrupted sleep, circadian misalignment, and impaired glucose regulation. While study designs vary, the overall evidence suggests that reducing nighttime light exposure could play a role in lowering diabetes risk.
Why It Matters For Night Shift Workers and Night Owls
Night workers are routinely exposed to bright light at times when the body expects darkness. This review shows how that light exposure may directly contribute to poorer blood sugar control and higher diabetes risk. For shift workers, it highlights the value of “light hygiene”—using lighting strategically during shifts, then reducing exposure before daytime sleep—to better support circadian health and metabolism.
Notes
Diabetes & Metabolism Journal (open access).