When people do not have a tracheostomy tube, their nose and mouth warm and humidify (moisten) the air they breathe. When you have a tracheostomy tube, the air no longer goes through your nose or mouth. This means the air you breathe is not moistened. You will need to add extra moisture to the airway so your secretions can be removed by suctioning or coughing.
Put an ultrasonic nebulizer or cool-mist humidifier where you sleep to help keep the air moist.
Some people do well with a heat moisture exchanger (HME) device. This fits over the tracheostomy tube and helps trap moisture.