According to Osho, Sufis call man a machine because ordinary human life runs on unconscious habits and automatic reactions from the past. We 'sleep-walk' through events, rarely tasting real awareness—perhaps only in sudden danger. A machine reacts; a conscious being responds. Only when awareness enters, breaking conditioned patterns and bringing responsibility to the present moment, does man cease to be mechanical and become truly human.
Most of the time you run on autopilot; waking up with awareness lets you choose new responses instead of knee-jerk reactions.