What helped me for awhile was attending the testicular cancer survivor's group. Then I had to come up with another cure....but the first rule is that I can't talk about it. And the second rule is that I can't talk about it.
Seriously, a few weeks ago I dialed my carbs WAY back from normal levels in a move to lower carb seasonal eating. For a few nights, I had trouble sleeping. I seem to remember something about insulin cascading into melatonin from Lights Out. Maybe Robb can jump in here on that.