These problems include changes in glucose tolerance, problems with cortisol concentrations, obesity, diabetes, mood disorders, and unusual pregnancy outcomes, including an increased risk of preterm birth in female shift workers (Tewari et al 14). It is unfortunate that those who are characterized as morning people typically have difficulty adjusting to the night shift (Natvik et al. 720). Likewise, those who consider themselves night owls have a harder time waking up early to report to work. Programming employees based on how their bodies work would benefit the facility and allow for greater productivity