What is the reason why a six-month-old baby does not sleep at night?

If a six-month-old baby doesn't sleep at night, it may be caused by his bad schedule, if he sleeps too much during the day, or the environment is too noisy, it will also cause the baby to not sleep at night. Secondly, it should be considered that it is caused by disease factors, most likely caused by trace element deficiency or calcium deficiency.