The baby sleep bad always wake up may be related to environmental factors, too excited, nutrient deficiency and other factors. 1. Environmental factors: when the indoor temperature is not appropriate, because the baby thermoregulation center development is not yet perfect, resulting in discomfort and sleep; when the indoor noise, light is too strong, etc. will make the baby sleep well always awake. 2. too excited: the baby’s nervous system development is not yet perfect, when the daytime laughing and playing too excited, the night after sleep, the nervous system regulation ability is poor, resulting in the baby can not enter a deep sleep, sleep is not good always wake up. 3. Nutrient deficiency: baby growth and development process, need sufficient vitamin D and calcium, bone development, neuromuscular system, immune system, tissue cell differentiation and metabolism is crucial. Vitamin D deficiency can appear rickets, early signs of increased excitability of the nervous system, so that the baby appears night terrors. Babies do not sleep well always wake up may have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.