If an individual goes a considerable amount of time without sleep, he or she can begin to experience auditory hallucinations. Because of the lack of sleep, neurons in the individual’s brain are under immense and prolong stress due to lack of repair that would be facilitated by sleep. Because these neurons are not functioning to their full capacity, activity within the brain becomes scattered and muddled, resulting in symptoms similar to psychosis (Melville). Individuals can also experience auditory hallucinations while under the influence of illicit drugs such as cocaine, ecstasy, LSD, and amphetamines. Hallucinations can also occur as a result of withdrawal from drugs or alcohol, as part of a drug induced psychosis