Bright light alone or combined with caffeine improves sleepiness in chronically sleep-restricted young drivers-V93 Bright light alone or combined with caffeine improves sleepiness in chronically sleep-restricted young drivers-V93 Download Letter to the editor of “Sleep Medicine” regarding the publication entitled “Acoustic stimulation time-locked to the beginning of sleep apnea events reduces oxygen desaturations: a pilot-study”, by Waeber et al-V93 The mediating effects of working hours, sleep duration, and depressive mood on the association between shift work and the risk of suicidal ideation in Korean workers-V93