The human nervous system is in essence an electrical system that through electromagnetism governs our bodily functions. Because it is electrical, it can be influenced by outside electrical and magnetic fields which in turn can impact how effectively the nervous system and related systems communicate and function. In particular, it may result in neuro-endocrine stress as a result of its impact on both the sympathetic and parasympathetic control systems. Symptoms such as high blood pressure, sleep disorders due to melatonin deficiencies, nervousness, etc. are common. Multiple studies correlate EMF exposure with diseases such as cancer, neurological disease, reproductive disorders, immune dysfunction, and electromagnetic hypersensitivity.