You may have a child who snores quite loudly. If this occurs only occasionally, it’s nothing to worry about and is fairly common in children. But snoring three or more nights a week, paediatricians say, particularly in conjunction with certain other behaviours, could be a symptom of obstructive sleep apnea, a potentially serious disorder in which the airway repeatedly becomes either partially or fully blocked during sleep – and breathing stops. About one in four children snore sometimes, according to the Cologne-based Professional Association of Paediatricians (BVKJ). Snoring caused by a block…