睡眠拖延的定義為個體在沒有外在環境因素促使的情況下，延後了原本預定就寢的時間（Kroese et al., 2014）。本研究十分好奇讓個體想要享受當下的快樂而不是睡眠的原因，並根據Baumeister（（ 2000）提到的自我調節理論與力量模型加以解釋造成睡眠拖延的原因。本研究推論由於自我控制資源是有限的，當個體為了專注於長期目標、抵抗誘惑，自我控制能力會如同肌肉一樣，因為付出了資源與能量，造成狀態自我控制耗損，因此個體到了睡前便容易產生睡眠拖延的情形。此外，本研究也好奇是否能夠透過職場環境因素來減緩狀態自我控制耗損對睡眠拖延的影響以及睡眠拖延對工作表現的傷害，於是從資源保存理論的觀點出發，納入華人文化十分重視的職場人際和諧作為調節變項，探究人際和諧能否用來減少狀態自我控制耗損、睡眠拖延的負面影響。過去許多研究探討自我控制特質、時型對睡眠拖延帶來的影響，過去大多從個人特質與個人行為的角度切入，而且招募的參與者多為學生，關於工商心理學領域的研究十分稀少。因此，本研究想從個人當下的狀態出發，思考職場工作者是否會因為狀態自我控制耗損，導致夜晚睡眠拖延情形，並進一步對隔天的工作表現帶來負面影響。同時，釐清職場人際和諧能否幫助員工保存更多資源並調節狀態自我控制耗損、睡眠拖延與工作表現間的負向中介效果。
以台灣私營企業89位員工為參與者，進行三階段的調查：第一階段蒐集控制變項與人口學變項資料；第二階段則採用日記法，為期10個工作天，分別在早上施測前一晚的睡眠拖延情形、在下午施測當天的狀態自我控制耗損和工作表現；第三階段則蒐集職場人際和諧的資料，最後獲得811筆三階段的配對資料。資料分析上則採用階層線性模型（HLM）、Multiple SEM及蒙地卡羅方法進行分析。研究結果顯示，狀態自我控制耗損對睡眠拖延有正向影響，雖然狀態自我控制耗損透過睡眠拖延影響工作表現的中介路徑沒有達顯著效果，但是研究發現職場人際和諧做為調節變項，可以有效地減緩睡眠拖延對工作表現的損害。在調節式中介模型中，在高人際和諧的情況下，狀態自我控制耗損越高，反而工作表現越高；而在低人際和諧的情況下，狀態自我控制耗損越高，工作表現越差。最後，將會探討研究結果之貢獻與研究限制，並提出未來可行的研究方向，希冀本研究能夠豐富台灣有關睡眠拖延的實務研究，並擴充睡眠拖延在工商心理學領域的討論。

Bedtime procrastination is defined as failing to go to bed at the intended time, while no external circumstances prevent a person from doing so (Kroese et al., 2014). The study hypothesizes that due to limited self-control resources, individuals experience self-control resources depletion and then lead to bedtime procrastination. Besides, this study is also curious about how to decrease the harm of bedtime procrastination. Therefore, drawing upon the theory of conservation of resources, the study hypothesizes that interpersonal harmony can reduce the negative effect of state self-control depletion as well as bedtime procrastination.
Previous studies have examined the impact of trait self-control and chronotype on bedtime procrastination. Most of them focus on individual characteristics and recruit student participants. However, there is little research regarding workplace professionals. Hence, this study wants to explore whether employees’ state self-control depletion will lead to bedtime procrastination. Furthermore, the study investigates how bedtime procrastination influences next-day work performance. Also, this research wants to figure out whether interpersonal harmony can help employees to conserve resources and then moderate the negative effect from state self-control depletion and bedtime procrastination. The study uses Hierarchical Linear Modeling (HLM) , Multiple SEM, and Monte Carlo methods for data analysis.
As anticipated, research findings indicate that state self-control depletion has a positive impact on bedtime procrastination. Although the mediating effect of bedtime procrastination on the relationship between state self-control depletion and job performance did not reach statistical significance, the study found that workplace interpersonal harmony serves as a moderating variable. It can effectively mitigate the detrimental effects of bedtime procrastination on job performance. In the moderated mediation model, under conditions of high interpersonal harmony, higher state self-control depletion is associated with better job performance; whereas under conditions of low interpersonal harmony, higher state self-control depletion is associated with poorer job performance. Finally, the contributions and limitations of the research will be discussed, and feasible directions for future research will be proposed.

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