I'm Always Tired And Fall Asleep Easily At Any Given

I'm always tired and fall asleep easily at any given time. I noticed I have the tendency to eat sweet and or starchy foods more than usual. I have frequent urination which is very strong smelling but very light in color.
I work at UPS loading trucks 6 days a week,from 10:00pm to 6:30 am, and have been doing this since August, coincidentally that is also when my unusual sleeping and eating habits started. Also diabetes does run in my family.