Table 1.

Some key features of sleep apps and design considerations.

Sleep app features	Frequency	App design considerations	Frequency
Sharing information: being part of a social community	4	Personalisation	4
Instant feedback	4	Simple device	2
Education	3	Evidence-based	10
Monitor	34	Theory-based	6
Alarm	5	Low cost	1
Relaxation exercises	3	Accessible format	1
Measure sleep	6	Easy to use	2
Diary	5	Engagement	5
Sleep disorder screen	5	User control	1
Recommend ideal sleep time	2	User centered	3
Sleep–wake detection	2	Social connectedness	4