Study	Reason for exclusion
Baskett 2003	Study exclusion criteria included cognitive impairment as measured by score below 26 on Mini‐Mental State Examination. Sleep quality was only outcome measured by the study.
Bourne 2006	Participants were not diagnosed with dementia or cognitive impairment.
Dowling 2008	Unable to separate effects of combined interventions of bright light therapy and melatonin.
Eeles 2003	No record of study completion.
Furio 2007	This melatonin for cognitive impairment study does not include those with dementia (only a 12% risk of developing dementia).
Haffmans 2001	Unable to separate effects of combined interventions of bright light therapy and melatonin.
Haworth 2001	Reply from author on 20 February 2005 indicated that study did not proceed due to lack of funding.
Peck 2004	Participants were not diagnosed with dementia or cognitive impairment.
Riemersma 2004	Unable to separate effects of combined interventions of melatonin and bright light therapy.
Riemersma‐van der Lek 2005	Unable to separate effects of combined interventions of bright light therapy and melatonin.
Savaskan 2006	Literature review. The article does mention two placebo controlled trials, however they are not named in the text.
Singer 2005	Sleep quality was only outcome measured by the study.
Tozawa 1998	Sleep waking and activity levels were measured concomitantly in the study.
Valontonin 2005	Sleep outcomes were the only outcome measured in the first study. The second study measured sleep quality and activity levels for fairly healthy older adults living in rest homes.