My days and nights just run together now, they have for years. Once you work a few nights in a row on 3rd shift, everything becomes one big blur. If I want to stay up and see the sun come up, no problem. Although there is nothing like sleeping at night. I never get the same quality sleep if I sleep during the day. I'm a night person, I'm a morning person, I'm a day person. Sleep is for the weak. Still my face doesn't have many aging lines but I have a few stray gray hairs.