“…However, many of these studies relied on either a rather narrow conceptualisation of wellbeing and/or a limited scope of their measurement of wellbeing; for example, by operationalising sleep quality (Steptoe et al, 2008) or sleep duration (Hamilton et al, 2007) as physical wellbeing constructs, and by measuring psychological wellbeing with a global indicator (Nagyova et al, 2005), or a single item measure of mental and physical health (Sawatzky et al, 2010;see also Lyubbomirsky, King, & Diener, 2005, for a review). Moreover, most of these studies were conducted with general adult populations (see Bize et al, for a review), particularly adults with physical vulnerabilities, including people with chronic fatigue symptoms (Van Damme et al, 2006), spinal cord injury (Ginis et al, 2010), or rheumatoid arthritis (Nagyova et al, 2005).…”