Is it normal to feel exhausted 24/7?

Growing up, I was always tired throughout the day. It didn't matter what time it was, I could lay down and sleep at any time. I could fall asleep in bed, standing up, at a concert, etc. Three years ago I fell asleep behind the wheel and totaled my car. I was driving 55 mph and hit the back end of a stopped car. Two days ago, I fell asleep at the wheel again (or so I think... I'm not really sure if I fell asleep or was knocked out?). I crossed oncoming traffic at an intersection and went up onto the sidewalk taking out a light post.

No matter how much caffeine I drink, it does absolutely nothing for me. And I have tried to not drink caffeine and I basically have to hold my eyes open, not to mention I am a super crab.

I am an active person. I go to the gym five nights a week. I am always trying to clean the house every day. I have about a four hour window every day where I am "okay" and that is from about 6:00 pm - 10:00 or 11:00 pm. This is where I fit the gym and household cleaning in. BUT, this does not help me for getting to work and getting through the work day. I am constantly nodding off at my desk, even being woken up by my head hitting the desk.

I have no health insurance so going to the doctor is out of the question at the moment. Does anyone have any idea what this could be and if it can be treated? I hate feeling like I have to fight to stay awake. It is not convenient and it makes me feel lazy when all I ever want to do is sleep.