Seli dis: Do you think our environment, even in the city versus a rural area, changes the way that we sleep? Seli dis: There's probably some evidence, in some research done looking at the differences between rural and urban populations. But i think there's kind of two major drivers, one of them being light, and then one of them is food availability. While there might be some light out in the country, it's not going to as intense and bright as in the city.