When a person is absorbed in a process and engaged in it he or she becomes more hypnotizable. A highly hypnotizable state can also be induced through sensory overload. But some people are naturally more hypnotizable than others and these are known as somnambulists. A professional background where someone is used to taking orders (police or navy for example) may predispose a person to be highly hypnotizable. The bottom line is always absorption in the process!