A 2-day-old neonate, born at 33weeks of gestation and weighing 1.5kg, has 3 episodes of apnoea, each lasting for around 25 seconds and occurring after a feeding. During these episodes, there was bradycardia and extremities were cyanosed. Blood sugar is 50 mg/dL and serum calcium is normal. Which of the following is true regarding the apnoeic periods?