What is normal, healthy infant sleep?

I am awake writing this during the biologically normative and healthy stages of first and second sleep. Research has revealed that right up until the advent of electric light, humans normally experienced 2 distinct segments of sleep. Learn how artificial light and industrialization have not only affected our adult sleep quality but also now dictates that our infant's biological sleep patterns must be "wrong" because they do not fit with our modern concepts of productive time -- and why this isn't just unfair, but downright unhealthy.