在許多的研究證明睡眠期過短可能導致代謝上的改變而造成肥胖、胰島素抗性、糖尿病及心血管等疾病。當回顧一些流行病學的研究也發現睡眠時間少與身體質量指數增加相關，而在孩童及年輕人睡得少的族群發現其有增加體重及肥胖的危險。綜合以上證據顯示，睡眠時間變短可能是近年來日益嚴重的肥胖問題的一個重要因素。本研究目的旨在了解大學生的睡眠品質，並釐清睡眠時間與身體質量指數之相關性。以600位大一新生為研究對象，以匹茲堡睡眠品質量表（Pittsburgh Sleep Quality Index, PSQI）為工具，測驗所得數據以SPSS for windows 18.0套裝統計軟體處理，以單因子變異數分析、卡方檢定、Scheffe多重比較等統計方法進行比較分析，顯著水準定為α=.05。結果：一、睡眠總分（PSQI>5 分）的比率為52.3%，睡眠總分PSQI≦5分的比率為47.7%。二、睡眠時數7 小時以上者的睡眠總分PSQI≦5分的比率為75.4%，睡眠時數6小時以下者的睡眠總分PSQI>5 分的比率為66.3%。三、男生部分，睡眠時數7小時以上者與5 小時以下者，在睡眠總分、睡眠效率、睡眠品質主觀感受及白天功能障礙上有顯著差異（p<.05）；而女生部分則是在身體質量指數、睡眠總分、睡眠效率、睡眠品質主觀感受、藥物使用及白天功能障礙上有顯著差異（p<.05）。本研究結果發現：大學生睡眠時間的長短可能與身體質量指數與睡眠品質好壞有關，而每日至少7小時的睡眠會擁有較好的睡眠品質。

On the basis of increasing evidence that short sleep duration results in metabolic changes that may contribute to the development of obesity, insulin resistance, diabetes and cardiovascular disease. We reviewed epidemiological studies associating short sleep with increased body mass index (BMI) that have shown an increased risk of weight gain and obesity in children and young adults who are short sleepers. Altogether, the evidence points to a possible role of decreased sleep duration in the current epidemic of obesity. The purpose of this study was to use Pittsburgh Sleep Quality Index to investigate the sleep duration, sleep quality and BMI in university students. The participants included 600 college students (255 male students with mean age 19.3±0.9 years and 345 female students with mean age 19.2±0.7 years). All data were processed by SPSS for windows 18.0 system. The investigated values were presented by descriptive statistics method chi-square test and Scheffe post-hoc, were considered to be significant if the p value was <.05. Results revealed that 52.3% reported PSQI scores above the clinical cutoff of 5. A better Global Score (PSQI≦5) with sleep >7 h/night is 75.4% and worse Global Score (PSQI＞5) with sleep <6 h/nigh is 66.3% in all subjects. Male students with sleep >7 h/night compared to sleep <6 h/nigh, are significant different in the sleep score, sleep efficiency, subjective sleep quality and daytime function. In addition, the female students are more significant different in BMI and drug medication. We concluded that sleep duration may be related to the BMI and sleep quality in university students and at least 7 hours of sleep will have a better quality of sleep.