I have recently had a work schedule change. I now work from 11:30 PM until 8:00AM. I went on vacation last week and my body goes back to PM shift hours which are 3:30PM until 12:00AM. I have to change my hours back just after Thanksgiving. These hours are not normal to me. I have always been a PM shift type. They won't change my hours. I "signed up to work any days and any hours". They can change me anytime. What is best for the division over rules everything. I have a very hard time especially on my days off. I have to try to keep the same hours on my days off or I will go back to the PM hours.It is hard to stay up all night. I just want to sleep all night. Does anyone think that the work hours contribute to my condition?