Symptoms and causes of nasal congestion in children at night Nasal congestion in children at night is very common. This symptom can be temporary or long-term. Nasal congestion is often caused by seasonal allergies, dry air, or a cold. When your child feels sick, they feel uncomfortable falling asleep at night, and lack of sleep can affect your child\’s health. So how to effectively relieve children\’s nasal congestion at night? Here are some ways. Properly humidifying a dry indoor environment is a common cause of nasal congestion. In order to relieve the symptoms of children\’s nasal congestion at night, it is necessary to increase the indoor humidity appropriately. Using a humidifier is a great way to increase indoor humidity. humidify