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1. This randomized controlled trial found that patients with more severe depressive symptoms exhibited more significant underestimation of total sleep time and discordance between diary-based and actigraphic sleep parameters. 2. However, those who received bright light therapy showed greater improvements in diary-based time to fall asleep and rise time than those in the control group.

Fitness trackers are offering increasingly sophisticated data on your sleep, but could they be increasing sleep anxiety? Kate O'Halloran asks the experts.

Objectives: To investigate: (i) the chronicity and phasic variability of sleep patterns and restriction in recruits during basic military training (BMT); and (ii) identify subjective sleep quality in young adult recruits prior to entry into BMT. Design: Prospective observational study. Methods: Sleep was monitored using wrist-worn actigraphy in Army recruits (n = 57, 18–43 y) throughout 12-weeks of BMT. The Pittsburgh Sleep Quality Index (PSQI) was completed in the first week of training to provide a subjective estimate of pre-BMT sleep patterns. A mixed-effects model was used to compare wee...