“…Researchers have recognized the important role of sleep in psychological functioning (De Koninck, 1997). The quantity and quality of sleep predicts cognitive performance (see Pilcher & Huffcutt, 1996; Wesensten, Belenky, & Balkin, 2006), as well as psychological and physical health (Barton, Spelten, Totterdell, Smith, & Folkard, 1995; Dolan, Adler, Thomas, & Castro, 2005; Naitoh, Kelly, & Englund, 1990).…”