The present invention discloses a series of piperidine derivatives as orexin receptor antagonists and compositions thereof, and relates to the application thereof in preparing medications for the treatment of insomnia, chronic obstructive pulmonary disease, obstructive sleep apnea, hypersomnia, anxiety, obsessive-compulsive disorder, panic attack, nicotine addiction, or binge eating disorder.本發明公開了一系列作為食慾激素受體拮抗劑的呱啶衍生物及其組合物,並涉及其在製備治療失眠、慢性阻塞性肺病、阻塞性睡眠呼吸暫停、嗜睡、焦慮、強迫、恐慌、尼古丁依賴或飲食混亂障礙的藥物中的應用藥物中的用途。無。