“…Although, sleep researchers have begun to analyse whether socio-economic circumstances are linked to sleep quality, they rarely examine multiple socio-economic variables. Research has found poor sleep quality associated with lower educational qualifications (Gilles, Lichstein, Scarinci, Heith Durrence, Taylor, Bush et al, 2005;Kietjna, Wojtyniak, Rymaszewska & Stokwiszewski, 2003;Hartz et al;Moore et al, 2002;Stewart, Besset, Bebbington, Brugha, Lindesay, Jenkins et al, 2006), unemployment (Hartz et al, 2007;Paine, Gander, Harris, & Reid, 2004;Rocha, Guerra, Fernanda & LimaCosta, 2002), and low income (Hartz et al, 2007;Lauderdale et al, 2007;Hall, Bromberger & Matthews, 1999). These studies have not systematically examined the independent effects of a range of socio-economic variables, nor whether the patterning of SES with sleep quality is mediated by other variables.…”