[Jackmcgee]

I've been googling around for a few days and haven't seen someone post something that's quite like what happened to me, so I figure it can't hurt to ask here for input. Before that, just some quick background:

I'm 19, male, and a full-time college student.
Aside from that, I haven't been able to land a job and I still live with my parents, so no bills to pay and no real financial responsibilities.

About five days ago, I went to sleep at around an hour before midnight. I had class at eight in the morning that next day, and I didn't get an ounce of sleep. I shrugged it off, went to class, and drove back home.

That night, I laid in bed and STILL could not get to sleep. My dad told me to take a NyQuil, and finally at about 2 in the morning, I dozed off for eight hours.

Next night comes around, and I managed to sleep for three hours at around 1 in the morning, waking up at 4. Getting very worried by now, I keep it in the back of my mind throughout the day and went bed pretty early that day, failing to sleep for about an hour, after which I gave up and took another NyQuil. I went to sleep at around 11 and slept for about thirteen hours.

Finally, last night, I managed to pull about three hours of sleep, which I guess I can't say is too surprising considering the amount I slept the night before. I tried to take a three hour nap just a couple of hours ago, but once again, just couldn't make it happen.

So, what is happening?

Exercise isn't the problem, I have a routine at a gym that I follow.
I've never been the easiest sleeper, but I wouldn't describe myself as an insomniac.
Nothing monumental or life-changing or anything that happened in the recent weeks, and excluding feeling tired and irritated when I haven't slept in a while, there's nothing wrong with me.

Apologies for the lengthy post, and thanks for any/all input.

[bluMyst]

Here's a completely wild guess:

The half-life of caffeine in your blood stream is about 6 hours for the average person, but if your liver is screwed up, it can get much higher. (Wikipedia says there's a person whose half-life is 168 hours or something crazy like that)

Maybe you should go a few days without coffee and see what happens.

[Jackmcgee]

I'm sure someone else has gone through this at one point or another...

This week actually went a little better, I was able to fall asleep all the majority of week days, although it was sort of fragmented, I usually managed to pull off 6 to 8 hours a day, I usually was asleep before midnight.

Last night went a little different for some reason, I didn't fall asleep until like 3 in the morning, although I did finally sleep for about six hours after that.

Anyways, I'm sure it's just all in my head or something.
When I don't sleep properly, I start stressing myself out because I feel like crap in my classes; my classes are math-heavy, so on any small mistake I do starts messing with my marks, and I also don't feel as energetic to be able to go out and work out like I'd like to.

Does anyone have any suggestions or helpful tips or the like?

I've tried Melatonin and have only taken it twice in the past week, and to be honest I can't really feel that much of a difference when I take it. I've taken about 0.75 mg and 1.5 mg doses.

I don't want to go into sleep aids or any of that stuff.