Job positions related to customer service can affect workers' psychology and even lead to sleep disorders, a survey showed Friday.

According to the survey of 13,066 paid workers aged between 20 and 65, those working at customer service job positions complain of sleep problems.

The workers who frequently have to deal with angry customers are six times more likely to suffer sleeping disorders than normal people, according to the survey.

The survey was conducted by a team led by Yoon Jin-ha of Yonsei University and was published in the latest journal by the Korean Medical Academy of Science.

"Job positions that require emotional consumption can not only affect workers' feelings during business hours but can also lead to sleep deprivation, tiredness and other chronic illnesses," Yoon said.

Male and female workers who constantly deal with angry customers are at danger of getting sleeping problems. They are 5.46 and 5.59 times more likely, respectively, than those who do not face such customers to suffer from such ailments.

"Workers whose main job requirements are dealing with customers should pay extra attention to their working environment," Yoon said.  (Yonhap)