This is called poor sleep-onset association. Providing entertainment during the night. Being brought to the parents' bed makes the problem far worse. Trained night crying can also begin after situations that required the parents to give more nighttime attention to their baby for a while. Examples of such problems are colds, discomfort during hot summer nights, or traveling.
Many babies quickly settle back into their previous sleep patterns after such situations.
However, some enjoy the nighttime contact so much that they begin to demand it. Believing any crying is harmful. Crying is their only way to communicate before they are able to talk. Crying for brief periods is not physically or psychologically harmful. If you try the following recommendations, your child's behavior will probably improve in 2 weeks.