Dossier
Kleine-Levin syndrome
Coverage of Kleine-Levin syndrome in the Nexus archive.
- Sleeping Beauty syndrome: 'For a week, I slept 15 to 20 hours out of every 24'
Sleeping Beauty syndrome, also known as Kleine-Levin syndrome (KLS), is an extremely rare condition that primarily affects boys. It is characterized by episodes of excessive sleep lasting one to more weeks, often accompanied by cognitive and behavioral disturbances.