What's the kundalini syndrome?

Kundalini: The Kundalini syndrome has been reported in people with near-death experiences or with some types of yoga & meditation. The main sx is a feeling of energy or heat at the spine. It can also include severe headaches, sense of energy or heat in the hands, ecstasy, body tremor or vibration, sense of heat or cold moving through the body, sensing inner lights as well as other tactile experiences.