These links have been helpful to me when researching Kleine Levin Syndrome. I hope they will be helpful to you as well.
Dr Isabelle Arnulf (French)
Stanford KLS study – Currently recruiting
Kleine-Levin syndrome: a systematic review of 186 cases in the literature. https://www.ncbi.nlm.nih.gov/pubmed/16230322
Quora.com Hypersomnia space This is a space that my wife and I curate for information about hypersomnia, including science and personal experiences about Kleine Levin Syndrome, narcolepsy and Idiopathic Hypersomnia (IH).