Sleeping Disorder?

I think I have something wrong in my brain about sleeping.
Either I get 4-5 hours sleep over 24 hours, not necessarily all at one time, or I cannot wake up right and I nap on and off semi uncontrollably all day.
This has been happening for well over 2-3 years. At first I thought I just needed a nap sometimes.  I was falling asleep before I could even lay down.  A few times last summer I even almost "fell asleep" at work, at the cash register, while standing up.
Sometimes I can't sleep though.  Like last night, I was up til 4 and didn't sleep well, but was up by 9 am.  I found myself falling asleep at the computer around 5 pm.  I went to lay down, but was no longer "sleepy".  Now it is roughly 4 am again and wide awake.
I don't know what to do.  I do not have insurance or a job so I cannot afford a doctor.  It isn't an emergency room situation. Although it nearly was a few times when I found myself getting the sleepies while driving and had to literally stop the car somewhere.
I have fallen asleep at family functions, with friends over, even in church.  Luckily though, my church family sort of knows something is wrong and keeps an eye on me.  When I fall asleep, I SNORE.. LOL. They wake me up before I can get loud.
I think some of my family has wondered if I am or was on drugs.  No. I will admit to having smoked pot a handful of times over the last year, my episodes are nowhere near those occasions. I don't even take over the counter sleeping medications. 
I really don't know what to do about this.
But here I go to lay down...