Safety Commission, or UCPSC, reports it receives about 10 reports per year where nightlights close to flammable materials were cited as responsible for fires; they recommend the use of nightlights with bulbs cooler than the four or seven watt incandescent bulbs still used in some older products. Potential health issues and benefits A University of Pennsylvania study indicated that sleeping with the light on or with a nightlight was associated with a greater incidence of nearsightedness in children. However, a later study at Ohio State University contradicted the earlier conclusion. Both studies were published in the journal Nature. Another study has indicated that sleeping with the light on may protect the eyes of diabetics from retinopathy, a condition that can lead to blindness. However, the initial study is still inconclusive. The optimal sleeping light condition is said by some to be total darkness. If a nightlight is used within a sleeping area, it is recommended to choose a dim reddish light to minimize disruptive effects on sleep cycles. In addition, nightlights may be useful in locations other than sleeping areas, such as hallways, bathrooms, or kitchens, to allow late night trips to be made without turning on the full light, while preserving a dark sleeping environment. References External links Light fixtures Light