My wife has diabetes lately she has be feeling tired and sleepy?

Many possibilities: Encourage your wife to be seen by her doctor. There are many reasons for being unusually tired - often, just being too busy is the answer. But since she is diabetic, she is at greater risk for more serious concerns such as heart disease. Particularly in diabetics - and particularly in women, heart disease symptoms can be very subtle. Don't take a chance. Good luck. LGromkoMD

Too many things....: High blood sugar, anemia, hypo or hyperthyroid, heart disease, lung disease, sleep disorders, anxiety, infection, inflammatory disease. You have given us too few symptoms to narrow this down. She needs a good history and exam and a few labs to help narrow this down.