Insomnia Beer

I am a beer snob.  I don't drink any beer that has "light" in its name.  I don't drink beer out of a can.  I don't drink beer out of a bottle that has a twist cap.  I like trying foreign beers and I like trying regional and local beers when I travel.  One of my favorite beers is Four Peaks Kiltlifter.  It was my regular beer of choice at one of the bars I frequent.  During the first couple of months when I started to frequent this bar, I started having bouts of insomnia.  I eventually narrowed it down to the nights when I had been to the bar, and narrowed it down even further to the beer itself.  I changed beers for a few weeks and the insomnia went away.  This was very disappointing, but ultimately necessary.  Unfortunately, I need to add another beer to my insomnia beer list.  Smithwick's.  I've had a few while visiting Ireland and had very poor nights of sleep.  The good news is that if I stick to just Guinness, then no problems.  Yay!  Fortunately, I have a short list of favorite beers that don't give me insomnia.