Dreams of pulling string out of your mouth is a classic example of “dream incorporation” – where an actual event that is physically occurring in or to your body becomes included into the story-line of a dream. Such dreams (which may also involve gum or hair) are often indications of an air blockage or difficulty breathing during sleep and have been known to be symptomatic of a life threatening sleep disorder called sleep apnea. For more information about sleep apnea, click here. To locate a doctor near you that specializes in sleep medicine, click here.