Sleep Disorders Articles Open Access

 Insomnia, the failure to sleep or sleep well at night, can be caused by fatigue, jet lag, a health disorder, the drugs you are taking or even the amount of coffee you are drinking. Many sleep disturbances or mood disturbances such as anxiety and depression, may also induce insomnia. Kleine-Levin Syndrome (KLS), also known as the "Sleeping Beauty" syndrome, is a rare neurological disorder characterized by recurring bouts of hypersomnolence (excessive sleeping) along with cognitive and behavioral wakefulness problems. Sleep-wake disorders occur when the internal clock of the body is not functioning properly or is out of sync with the environment around. ... Circadian sleep-wake rhythm disorders occur when the synchronization of circadian rhythms with the external environment is lost or when the circadian system itself is dysfunctional.