1. Overview of included studies.

Author	N	Female (%)	Specific sample characteristics	Primary insomnia	Method	Duration (weeks)	Single‐blind run‐out (days)
Ancoli‐Israel 2010	388	63	Elderly	X	Participant reports (diary)	12	14
Fava 2006	545	66.6	Comorbid depression	—	Participant reports (IVRS)	8	14
Goforth 2014	58	63	Comorbid back pain	—	Participant reports (diary)	4	—
Krystal 2003	788	63	—	X	Participant reports (IVRS)	24	— (follow‐up)
McCall 2006	264	67.4	Elderly	X	Participant reports (IVRS), PSG	2	—
McCall 2010a	60	66.7	Comorbid depression	—	Participant reports (diary); actigraphy	8	— (follow‐up)
Menza 2010	30	20	Comorbid Parkinsons disease	—	Participant reports (diary)	3	—
Pollack 2008	595	66	Comorbid anxiety disorder	—	Participant reports (diary)	8	14
Roth 2009	153	86.9	Comorbid rheumatoid arthritis	—	Participant reports (IVRS)	4	7
Scharf 2005	231	57.8	Elderly	X	Participant reports (IVRS)	2	—
Soares 2006	410	100	Menopause	—	Participant reports (IVRS)	4	7
Spierings 2015	75	82.5	Migraine	X	Participant reports (diary)	6	2 (open label)
Walsh 2007	830	61	—	X	Participant reports (IVRS)	24	14
Zammit 2004	305	65	—	X	Participant reports (IVRS), PSG	6	2

^{IVRS: interactive voice response system}

^{N: number}

^{PSG: polysomnography}