Below is an article (in English) about a teenage girl who suffers from what is nicknamed "Sleeping Beauty Syndrome". It is a neurological disorder that causes one to sleep for long periods of time (reported cases say up to 8 weeks) and also causes Jekell and Hyde personality changes.
http://www.dailymail.co.uk/health/article-2285208/Sleeping-Beauty-syndrome-teenager-Lois-Woods-snoozes-44-DAYS-time.html
Additionally, there is an article from "Time" magazine about the disorder and treatments for it.
http://healthland.time.com/2012/11/23/new-treatment-for-sleeping-beauty-syndrome/
