No, but I actually have the opposite problem- I could stay awake for days! I have to take something at night to make me sleep.
Is there a specific time of the day when you are sleepy, or all day long?
I agree with Suzanne and Susan- maybe try to exercise at the times you get sleepy- even a quick 5 minute walk will help stir things up. Also, I take One-A-Day's "Weight Smart" multi-vitamin, and that has some herbs to help give your metabolism a boost, and drinking green tea might also help- that has a tiny bit of caffeine, but the properties of the leaves boost your metabolism as well, and that will give you a little more energy.