Hypoglycemia in early infancy can cause jitteriness, lethargy, unresponsiveness, or seizures. Milder hypoglycemia in infancy causes hunger every few hours, with increasing jitteriness or lethargy. Stimulant users may take sedatives to calm excessive jitteriness. However, the jitteriness and alertness given by caffeine is decreased when additional alcohol is consumed. As with all energy drinks, Rockstar can cause jitteriness, anxiety, and high blood sugar levels. Evidence reveal that jitteriness/anxiety syndrome predicts an improved prognosis (level D). Jeff lightly shakes him to give the feeling of jitteriness. In October 2017, some handsets had a display touch scrolling "jitteriness" issue.