How to deal with a child who sometimes cries a lot at night while sleeping

Patient's question:

Detailed medical condition and consultation purpose: At night when sleeping, sometimes I always cry, but there are no physical discomforts! It's so annoying! I can't even speak yet.
What is going on?

Doctor's answer:

Hello: Due to long-term anorexia and improper handling, children have exhibited a two-polar phenomenon: the "bean sprout type" and the "chubby type." The former indicates deficiency, while the latter indicates excess, both resulting from "improper feeding."
Infants and young children grow rapidly and have a highly active metabolism. Young mothers, due to a lack of understanding of the nutritional value of breast milk, and young fathers, who know nothing about it either, gradually lead to children's failure to gain weight, thinness, shorter height than normal, poor complexion, night sweats, and other symptoms following one after another. Children have extremely poor adaptability to climate changes, are prone to colds, and any slight carelessness in feeding can lead to digestive problems. Ultimately, malnutrition is the consequence of these issues.
So, how can we prevent and treat these situations?
First and foremost, we must strongly advocate for breastfeeding for at least 2 to 3 months. When infants are 3 to 4 months old and it's time to introduce complementary foods, they should be fed on a schedule and in fixed quantities, with a balanced combination of meat and vegetables, alternating between rice and noodles, to avoid the habit of snacking and drinking cold drinks. The indoor air must be kept circulating and fresh. Children should not be kept indoors all day like "canaries," but should be taken outdoors regularly to sunbathe to prevent rickets. Children's sleep is also crucial. Children aged 3 to 4 must sleep for at least 10 hours a day, with a nap of no less than 2 hours. Otherwise, the brain remains in a state of excitement, making it difficult to eliminate fatigue, which will affect gastric secretion and reduce appetite. Children's anorexia does not develop overnight. Do not immediately assume it is "milk scrofula." The so-called "milk scrofula" is actually rickets + anemia +