SummaryThe sustained attention to response task comprises withholding key presses to one in nine of 225 target stimuli; it proved to be a sensitive measure of vigilance in a small group of narcoleptics. We studied sustained attention to response task results in 96 patients from a tertiary narcolepsy referral centre. Diagnoses according to ICSD‐2 criteria were narcolepsy with (n = 42) and without cataplexy (n = 5), idiopathic hypersomnia without long sleep time (n = 37), and obstructive sleep apnoea syndrome (n = 12). The sustained attention to response task was administered prior to each of five multiple sleep latency test sessions. Analysis concerned error rates, mean reaction time, reaction time variability and post‐error slowing, as well as the correlation of sustain…

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