Lethargy and other sleep disorders are common in people who suffer from the typhoid fever. It means that a patient diagnosed with this disease will fall asleep because of being exhausted and tired all the time without a good reason. A person also becomes rather sluggish and unfocused. It takes more time to solve everyday problems and evaluate things objectively. Besides, a lot of energy is wasted on a fight with the virus. That is why a patient feels like in a daze.