As lifestyles have shifted to favor nighttime activities, daytime sleepiness and sleep-related problems have become increasingly common in Japan. Excessive daytime sleepiness (EDS) is an adverse consequence of sleep loss and an important public health concern. EDS may cause academic difficulties, behavioral abnormalities, and psychological dysfunction; therefore, it is a particularly important issue among university students. We conducted a cross-sectional study to investigate the prevalence of EDS and its associated lifestyle factors among Japanese university students. A questionnaire was completed by 1470 first-year university students, aged 19.0 (± 1.0) years. Using the questionnaire, we collected information on (1) demographic variables, (2) lifestyle variables, and (3) sleep habits and daytime sleepiness. Daytime sleepiness was measured using the Japanese version of the Epworth Sleepiness Scale, a frequently used subjective scale for assessing sleepiness. The overall prevalence of EDS was 57% (53% in men and 61% in women). Multivariate logistic regression analysis revealed that the following factors were associated with EDS: female sex, exercise habits, long commuting times, later wake-up times, and shorter sleep duration. Given that more than 50% of first-year university students reported having EDS, interventions should be considered to decrease its risk, including educational programs that provide strategies to extend sleep duration and delay wake-up time. Such strategies may also be valuable for students with other potential risk factors, such as exercise habits or long commute times, that are associated with EDS.

随着生活方式转向夜间活动，日间嗜睡和睡眠相关问题在日本变得越来越普遍。白天过度嗜睡（EDS）是睡眠不足的不利后果，也是一个重要的公共卫生问题。EDS可能导致学业困难、行为异常、心理功能障碍；因此，这对于大学生来说是一个尤为重要的问题。我们进行了一项横断面研究，调查日本大学生中 EDS 的患病率及其相关生活方式因素。调查问卷由 1470 名年龄为 19.0（±1.0）岁的大学一年级学生完成。通过问卷，我们收集了以下方面的信息：(1) 人口统计变量，(2) 生活方式变量，以及 (3) 睡眠习惯和白天嗜睡。白天的嗜睡程度是使用日本版的 Epworth 嗜睡量表来测量的，该量表是一种经常使用的评估嗜睡的主观量表。EDS 的总体患病率为 57%（男性为 53%，女性为 61%）。多因素logistic回归分析显示，女性、运动习惯、通勤时间长、起床晚、睡眠时间短等因素与EDS相关。鉴于超过 50% 的一年级大学生报告患有 EDS，应考虑采取干预措施来降低其风险，包括提供延长睡眠时间和延迟醒来时间策略的教育计划。此类策略对于具有其他潜在风险因素（例如与 EDS 相关的运动习惯或通勤时间长）的学生也可能很有价值。