Sleep, Sleep...Where Hides Sleep?

I have a huge investigation~~probably the biggest one that I will ever do~~and it's fewer than 12 hours away. I cannot sleep. I have tried everything, including counting sheep.

I realize that stress is here involved but it really shouldn't be. I mean, it's just an investigation, right? I've done so many already. It's not as if my ability to "see" things is suddenly, without reason, going to fail. It's not as if I don't enjoy these events.

I don't know what it is: perphaps I am excited about the investigation?

I need sleep!