A survey on sleep assessment methods

[EN] Purpose. A literature review is presented that aims to summarize and compare curren methods to evaluate sleep. Methods. Current sleep assessment methods have been classified according to different. criteria; e.g., objective (polysomnography actigraphy) vs.subjective (sleep questionnaires, diaries...), contact vs. contactless devices, and need for medical assistance vs. self-assessment. A comparison of validation studies is carried out for each method, identifying their sensitivity and specificity reported in the literature. Finally, the state of the market has also been reviewed with respect to customers' opinions about current sleep apps. Results. A taxonomy that classifies the sleep, detection methods. IA deseriPtion of each method that includes the tendencies of their underlying technologies lanalyzed in accordance with the literature. A comparison in terms, of precision of existing validation studies and reports. Discussion. In order of accuracy, sleep detection methods may be arranged as follows: Questionnaire < Sleep diary < Contactless devices < Contact devices < Polysotnnography A literature review suggests that current subjective methods present a sensitivity between 73% and 97.7%, while their specificity ranges in the interval 50%-96%. Objective methods such as actigraphy present a sensibility higher than 90%. However, their specificity is low compared to their sensitivity, being one of the limitations of such technology. Moreover, there are other factors, such as the Patients Perception of her or his sleep, that can be provided only by subjective methods. Therefore, sleep detection methods should be combined to produce a synergy between objective and subjective methods. 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