Unobtrusiveness is one of the main issues concerning health-related systems.
Many developers affirm that their systems do not burden users; however, this
is not always achieved. This article evaluates the obtrusiveness of various
systems developed to improve sleep quality. The systems analyzed are
related to sleep hygiene, since it has become an interesting topic for
researchers, physicians and people in general, mainly because it has become
part of the methods used to estimate a persons’ health status A set of design
elements are presented as keys to achieving unobtrusiveness. We propose a
scale to measure the level of unobtrusiveness and use it to evaluate several
systems, with a focus on smartphone applications. 

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