Anemic? 28w help!

At 15w I had blood work done and everything came back okay. I'm now 28w and can still hardly keep my eyes open! I get 6-7 hours of sleep and I have to take a nap before work. Then at work I fall asleep going to the bathroom. Should I talk to my doctor about this? I work the night shift so I always blame it on that but it would make my life so much easier if I didn't need 10 hours of sleep a day.