Van Meirhaeghe JP, Salmon LJ, O'Sullivan MD, et al. - Researchers evaluated alteration in sleep patterns prior to and following total hip arthroplasty (THA) and total knee arthroplasty (TKA) as well as its link with patient-reported outcome measures (PROMs: Knee Injury and Osteoarthritis Outcome Score, Hip Disability and Osteoarthritis Outcome Score, patient satisfaction, and 2 questions from the Pittsburgh Sleep Quality Index). For 780 patients, surgical data and PROMs were obtained. Poor quality sleep was experienced by 35% (270 of 780) before surgery. Worse sleep quality and duration were observed in women vs men, and in THA patients (39%) vs TKA patients. Based on these data, sleep quality and duration can be expected to improve following THA and TKA and such improvement was shown to be related to better outcome scores and satisfaction in this study sample.