Propranolol-induced Somnambulism: A Case-report in a Patient with Essential Tremor.

Essential tremor is a common neurological disorder characterised by postural and kinetic tremor. In the American Academy of Neurology 2011 evidence-based guidelines for the treatment of essential tremor, propranolol and primidone were the only two medications for which Level A recommendations were issued. Both medications are usually well tolerated. We recently prescribed propranolol to a 34-year old woman with essential tremor to alleviate her symptoms and encountered a rare adverse effect, somnambulism. We report the case here and perform a brief review of the literature on beta-blocker-induced sleep disturbance.