The Brazilian-Portuguese version of the Sleep Hygiene Index (SHI): validity, reliability and association with depressive symptoms and sleep-related outcomes.

Objective: To translate the Sleep Hygiene Index (SHI) to Brazilian Portuguese, to describe its psychometric properties and to show its association with sleep quality, daytime sleepiness, risk for sleep apnea and depressive symptoms.

Methods: Thirty subjects participated in the cultural adaptation and the item clarity evaluation. Twenty subjects answered the instrument in three different time-points for test-retest reliability.

Exposure to electronic devices and sleep quality in adolescents: a matter of type, duration, and timing.

Objectives: The objective was to describe (1) the type, (2) the amount of use, and (3) the time of usage of electronic devices, for school days and weekends, as well as its impact on adolescents' sleep quality.

Design: A cross-sectional study using hierarchical regressions accounting for confounding sleep-related variables was used.

Setting: The participants were from six public schools in Porto Alegre, Brazil.