According to a study published in Archives of Pediatrics & Adolescent Medicine, having fan on during sleep reduces risk of SIDS by 72 percent. That is a LARGE precentage. They interviewed parents whose babies died of SIDS and parents whose babies did not die, and determined that, among other factors such as sleeping position, surface, pacifier use, the fan use plays a large role in preventing SIDS.

The scientists explain that high concentration of carbon dioxide (the gas humans exhale) accumulates in bedding and other materials, can contribute to SIDS. Babies’ immature lungs cannot deal with high amounts of the gas. Fans improve air circulation and prevent accumulation of carbon dioxide.

Interesting stuff. Read more here