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Wallace, D.M., Sweetman, A. Comorbid sleep apnea, post-traumatic stress disorder, and insomnia: underlying mechanisms and treatment implications—a commentary on El Solh et al.’s Impact of low arousal threshold on treatment of obstructive sleep apnea in patients with post-traumatic stress disorder. Sleep Breath 25, 605–607 (2021). https://doi.org/10.1007/s11325-020-02107-z