“…Several surrogate terms have been used interchangeably with sleep disturbance . Although sleep disorder is a distinctly different term from sleep disturbance, it has been used to mean sleep disturbance in several studies (Bener & Al‐Hamaq, ; van Dijk et al., ; Keskin et al., ; Martins et al., ; Sridhar & Madhu, ; Voinescu et al., ). Other interchangeably used terms are sleep problem (Caruso et al., ; Cho et al., ; Olsson et al., ), sleep disruption (Barnard et al., ; Eshkoor, Hamid, Nudin, & Mun, ; Voinescu et al., ), disrupted sleep (Olsson et al., ; Sridhar & Putcha, ), abnormal sleep (Sridhar & Putcha, ), sleep complaint (Cho et al., ), sleep impairment (Martins et al., ) and impaired sleep (Chasens et al., ).…”