The current study investigated the impact of sleep deprivation (SD) on the use of third-person self-talk, a relatively effort-less strategy, to regulate emotion. Twenty-four participants (age = 22.75 2.68, 54.17% male, 33.33% good sleepers) com-pleted a cue-picture ERP paradigm after normal sleep and SD conditions, in which they viewed negative or neutral stimuliand reflected on their feelings using either the pronoun I or their name (third-person). We calculated post-instruction latepositive potential (LPP) that has been found sensitive to emotion regulation strategies and closely related to amygdalaactivity. While poor sleepers showed greater LPP amplitudes overall, F(1,7) = 17.50, p = .004, SD only increased the LPPfor negative picture trials among good sleepers but not poor sleepers, F(1,7) = 5.37, p = .054, suggesting that the effect ofSD on emotion regulation using third-person self talk was moderated by habitual sleep quality.

Sleep deprivation (SD) has negative effects on emotional regulation, but few studies have evaluated electroencephalo-graphic (EEG) indices and none of these have used a within-subject design. Twenty-nine participants (17 female) com-pleted a repeated-measures study protocol involving a night of normal sleep (NS) and a night of SD, followed by resting-state EEG during the following morning. Established EEG indices of emotion regulation, frontal alpha asymmetry (FAS)and slow wave/fast wave (SW/FW) ratio in frontal sites (F3, F4, Fz), were investigated. Our results did not reveal SD ef-fects in FAS (t28= -.960, p = .345) or in SW/FW ratio (t28= 0.737, p = 0.467). Although other studies have demonstratedemotional dysregulation after SD, two well-studied EEG markers of emotional dysregulation did not reflect altered emo-tional states after SD in the current within-subject study. Future studies combining EEG and other indices of emotionalregulation may help elucidate these results.