How Hard Do I Need to Push?

I feel confused tonight.  I got some nice ideas from people here as to how to get my sleep habits in line, and yet...
...no real progress there yet.  I mean, it's not that nothing was workable in there.  Something had to have been workable in there.  And it's not that the suggestions meant any harm (they didn't).
So what's stopping me?  I can't really put my finger on what it is.
I certainly feel overpowered by...things.  Letting out my thoughts here in the open -- especially with the last three or four entries here -- doesn't seem to have done enough, but that can't be it on its own.
I can hear a voice in my head saying, "What if _____ (fill in the blank with whatever coping mechanism you choose) doesn't work?", but that doesn't seem to explain it, either.
I know how bad I feel about what went down the semester gone by, and that I don't like my odds going into the fall, but I've never liked my odds going into anything, so that feeling is nothing new.
Is it a combination of all three, maybe?  Could someone just take a guess?