Level 1: What are the reasons for babies’ poor sleep? 1. Physiological reasons 1. Growth and development: Babies need a lot of sleep to promote physical development during growth and development, but sleep quality may be affected by physical changes during growth. 2. Hunger: If the baby is not full or hungry before going to bed, it will affect their sleep quality. 3. Physical discomfort: For example, diseases such as colds, diarrhea, allergies, etc. can make babies feel uncomfortable, thus affecting their sleep.