Kleine-Levin Syndrome (KLS)is a sleep disorder that makes 22 year old Alanna Wong fall into a trance without warning, sleep for 22 hours at a time and throw terrifying tantrums just like a toddler.
http://www.dailymail.co.uk/femail/article-2101496/Alanna-Wong-reveals-rare-sleep-disorder-Kleine-Levin-Syndrome-turns-toddler.html
Woman Constantly Falls into a Trance and Sleeps for 22 Hours
From the OneCebu archive, last updated February 10, 2014. Some details may have changed.
