Discussion: Overall, the findings of this study indicate ample availability of sleep instruments. Only four of the identified instruments were available in Arabic. Criterion validity and reliability measures were the most commonly reported properties. The review of the psychometric properties showed that the Insomnia Severity Index and the Functional Outcomes of Sleep Questionnaire were the most extensively evaluated instrument. Results: One hundred and seven articles were selected for inclusion, from which 31 instruments were identified and categorized based on the constructs they assess as: (1) screening for insomnia (n=14) (2) measuring the consequences of insomnia (n=8) (3) assessing the cognitive aspects of insomnia (n= 5) and (4) assessing sleep hygiene (n= 4). The quality assessment of the instruments was conducted using two established international criteria. Methods: A systematic literature search was conducted using the following electronic databases: PubMed, EMBASE, ProQuest Central, SCOPUS, and Google Scholar. In addition, the review also aimed to identify sleep instruments available in the Arabic language. This systematic review aims to identify, describe and summarize the psychometric properties of questionnaires available for the assessment of insomnia in the adult population. Introduction: Self-reported sleep instruments remain the most practical methods for the assessment of insomnia in clinical practice.
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