You know, I have talked to a number of people who used to work evenings and switched to days when openings came up. Pretty much everyone on my shift has moved to working days at this point. And most of them have complained about getting depressed during the winter. The only sun they are getting on workdays is a little in the morning on the drive to work. By the time they are driving home, the sun is half down. Even during the warmer months, I like having the best part of the day (morning) to myself, not being crunched to run to work and spend the most potent portion of my day's energy for someone else's cause. While all those day-shifters are clanging away, it's quiet and relaxing outside in the morning and it gives me time to think without being tired from the day's work.