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trained night crying
Trained night crying or trained night waking is the essentially inevitable result of habitually rocking or nursing a baby to sleep, or in general allowing him to fall asleep anywhere but in his own little bed. Trained night crying appears at around 8 months or so, when the child's sleep cycle changes from the irregular infantile type to the adult-type cycle. From that point on in life, the child will arouse briefly from sleep about every 90-110 minutes all night long. When he cannot go back to sleep easily without the presence of his mother, or his bottle, or both, he will cry for assistance. Mother will have to get up and go to assist him back to sleep. Trained night crying is often worsened by the appearance at about the same age of separation anxiety, which dramatically compounds the crying and agitation the baby experiences.
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