Clouding of consciousness is a condition characterized by confusion, drowsiness, and lack of focus. People experiencing this condition have difficulty processing information and may feel dazed or disconnected from reality. There are several synonyms for clouding of consciousness, including mental fog, brain fog, cognitive impairment, confusion, and mental haze. These words all describe a state of mind that feels murky or unclear, where thoughts and ideas are hard to grasp. Other related terms include disorientation, lethargy, and stupor. These conditions can be caused by many factors, including illness, medication, or alcohol consumption, and can be temporary or long-lasting depending on the underlying cause.