How can a man go from sane to insane in week?

It is incorrect to assume that a person can go from sane to insane in a week. Developing a severe mental illness or falling into insanity is not something that usually occurs rapidly or within a short time frame. Mental health conditions and behavior changes can develop gradually over time and encompass various factors. If someone appears to show sudden and extreme behavioral changes, it's essential to seek professional help from a mental health expert for proper evaluation and care.