Common clinical reasons for ten-day-old newborns not sleeping include vitamin D deficiency, incorrect eating, and uncomfortable sleep environments. 1. Lack of vitamin D: lack of vitamin D will lead to the newborn’s abnormal mental state at night or in a state of excitement and unable to sleep. 2. Incorrect eating: If a newborn baby eats too much or not enough before going to bed, it may cause gastrointestinal discomfort or a state of hunger, thus affecting sleep. 3. Uncomfortable sleeping environment: Parents wrapping their newborns too tightly and making them too hot and stuffy during sleep may cause them to have difficulty falling asleep; a noisy indoor environment may also lead to the same problem. Parents are advised to check their babies for related problems, and if the condition persists, it is advisable to go to the pediatrician of the hospital for consultation and targeted treatment.