Original seeds has a cross called grandaddy black(GDP x black domina)...I grew it last year,a friend gave me a clone from his seed plants.its the one strain that put me right out,and I also suffer from severe insomnia.i really wish I took clones from it,but I didnt.
I'm going to grab a couple more packs this summer for an indoor fall run.
Gods green crack also worked well for me.one other great insomnia strain is eleven Rose's from delicious seeds,very potent and slow the neurons down to a crawl!!