I Am Sleeping A Lot!. If I'm Off Work, I

I am sleeping a lot!. If I'm off work, I sleep for 12 + hours. I have also slept off and on for over 24 hours. I'll take the dog out, have a cup of coffee, eat a bowl of cereal and back to bed again. I work in a hospital and work (3) 12-14 hour shifts in a row but then sleep the rest of the days! I'm sleeping my life away!!! I'm almost 60 y/o and my mother said that I was the most sleepingist baby that she had ever seen I was 3 weeks late being born if that means anything. I have slept way too much even before I started working 12 hour shifts. My last physical was ~ 1 yr ago and lab work was normal but blood sugar was border line diabetic. I'm very over weight but yet I hardly eat ANYTHING! All of my friends that I associate with are aware of my very little food consumption. We all go out to eat and I take ~ 10 small bites of food and then I'm full. Everyone finishes their meal and I (the biggest one of the group) takes a to go box enough for 2 more meals!
Help me please!