I tend to dream about things that I spend large amounts of time doing. If I'm putting together a web site, I'll dream of HTML, JavaScript and the like. If I'm programming, I'll dream about whatever language that I'm using.

On many occasions I have awoken with the solution to a problem that I had been working on the previous day (or month for that matter).

However, dreaming in code is not always productive...
I also have a problem of coding myself into an infinite loop. I'll keep dreaming the same sequence of code over and over again until when I finally wake up, I'm exhausted from all of the stress the dream brought on.

And as for programming the alarm clock...
Sometime between the alarm going off and my brain waking up, I have a tendency to try to program it. Hitting the buttons in a cryptic sequence that in my dream makes perfect sense. Then one of two things happen.

1) I wake up and turn the alarm clock off (if it hasn't been silenced by my button pushing).
2) I wake up several hours later and realize just how late I am!