Unusual and unrealistic thinking by a person is called as psychosis. It is also a mental disorder under which the mental as well as emotional aspect of a person is affected adversely. Such a person lives in delusions or hallucinations. Even there is risk of getting hurt in such persons.
It is strange to know that such people may hear, smell, see or even taste such things that don not actually exist. People suffering from psychosis may experience disturbance in sleep and also feel difficulty in concentrating. Since it is a hazardous condition relevant to the brain therefore it is advised to take special care of such patients.