Why am I constantly sleepy?

It seems like every two hours I am so sleepy that I have to lie down down and take a nap. I drove out of town the other day and it was a nightmare trying to stay awake each way. I thought I would have to pull over and take a nap. Is this normal? And what can I do about it? I teach and am home right now for the summer, but I will be going to workshops starting next week and I'll have to stay awake all day. What do I do then.

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