“…This decline was statistically significant as indicated by the effect of time in Table 2. To what extent this improvement might have reflected treatment for insomnia is unknown because the study did not collect information about treatment received, although such treatments are effective in AD patients (Arnedt, Conroy, Armitage, & Brower, 2011;Currie, Clark, Hodgins, & El Guebaly, 2004;Friedmann et al, 2008). Previous studies of AD patients without insomnia-specific treatment have shown nonsignificant declines in insomnia severity over periods of 4-12 weeks (Cohn et al, 2003;Foster, Marshall, & Peters, 2000;Foster & Peters, 1999;Steinig, Foraita, Happe, & Heinze, 2011).…”