“…green space, weather, and traffic and other noise) (Astell-Burt et al, 2013; Buxton et al, 2012; Elmenhorst et al, 2012; Pandey et al, 2005; Pirrera et al, 2010), family and relationship factors (Ailshire & Burgard, 2012; Lallukka et al, 2013; Rhoades et al, 2012; Rogojanski et al, 2013; Troxel, 2010; Troxel et al, 2010b, 2010c; von Kaanel et al, 2012), and even the effects of a changing technological landscape (Brunborg et al, 2011; Crowder et al, 2012; Garmy et al, 2012; Lowden et al, 2011; Munezawa et al, 2011; Thomee et al, 2011, 2012) suggest that individual-level factors need to be viewed in the context of these social-level and societal-level factors. For example, the study by Gamaldo and colleagues mentioned above found no differences in sleep duration by race/ethnicity when the individuals were otherwise relatively homogeneous in terms of age and living environment (Gamaldo et al, 2013a). …”