RESUMO
BACKGROUND: Insomnia has been associated with decreased academic performance and unhealthy behaviors in university students. Although many studies have analyzed sleep phenomenology among this population, only few have focused on insomnia and its related variables. In addition, such studies do not always include a clinical interview or a specific and validated instrument for measuring insomnia. This study aimed to explore the prevalence of insomnia symptoms and the relationship between insomnia and health habits, mental health, and academic performance in a large university student sample. METHODS: Five hundred and eighty-two students were recruited from the University of Granada, Spain. Data were collected through an online survey with questions on sociodemographic and academic data and health habits as well as the Pittsburgh Sleep Quality Index, Insomnia Severity Index, Sleep Hygiene Index, and Sleepiness, Depression, Anxiety, and Stress Scales. A multiple regression analysis explored the relationship between academic performance, health habits, mood state, and insomnia symptoms. RESULTS: The prevalence of students with symptoms of insomnia was high (39.7%). A multiple logistic regression analysis revealed that depression, sleep hygiene, stress and anxiety were significant predictors of insomnia symptoms. Multivariate analyses revealed that subjective insomnia symptoms, sleep efficiency, and depression were significantly correlated with academic performance in a dependent way. CONCLUSIONS: In university students, anxiety, stress, and poor sleep hygiene are risk factors for insomnia, which plays an important role in academic performance. Promoting sleep and mental health could be a potentially effective way to improve their academic performance.
RESUMO
The Sleep Hygiene Index (SHI) has shown adequate psychometric properties in samples from several countries but has not been validated in Spanish. The aims of the study were to translate the original (i.e., English) version of the SHI into Spanish and to evaluate the psychometric properties of this instrument (i.e., factor structure, internal consistency reliability, and concurrent, predictive, and discriminant validity) in Spanish adults. The overall sample, comprising 548 university students, was divided into two groups based on their self-reported insomnia symptoms (Insomnia Severity Index) because sleep hygiene has been shown to be closely related to insomnia. The Pittsburgh Sleep Quality Index and the Stanford Sleepiness Scale were used for testing concurrent validity. The Depression, Anxiety, and Stress Scale was used for testing predictive validity. Three items were dropped from the original SHI scale due to their low factor loadings. The principal component analysis revealed a four-factor solution for the SHI, accounting for 65.58% of the total variance in the overall sample, for 65.34% in the noninsomnia group, and for 63.50% in the insomnia group. Factor 1 comprised items regarding sleep-disrupting behaviors; Factor 2 comprised items regarding cognitive activation; Factor 3 comprised items about bedroom comfort; and Factor 4 comprised items on sleep/wake time. Omega coefficient indices for the SHI ranged from 0.751 to 0.878 in the overall sample, from 0.734 to 0.822 in the noninsomnia group, and from 0.724 to 0.835 in the insomnia group. The Spanish version of the SHI can be regarded as a reliable tool with adequate concurrent and predictive validity for assessing sleep hygiene in Spanish people with or without insomnia symptoms.
