asleep on the job 玩忽职守

【例句】
He lost his job as a security guard after falling asleep on the job.
他上班时玩忽职守，于是丢掉了保安的工作。

As a team leader, the only thing that really insulted me, someone was asleep on the job.
作为项目领导人，唯一让我羞耻的是，居然有人在任务过程中玩忽职守。