Vì sao trẻ khó ngủ?
(SK&ĐS) - Rất nhiều nghiên cứu về chứng mất ngủ ở trẻ em và đã chỉ ra rằng, trẻ em sẽ có những vấn đề về hành vi và hành động nếu chúng không được ngủ đủ 8-10 giờ/ngày. Vậy vì sao trẻ khó ngủ?
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