The Brief Infant Sleep Questionnaire (BISQ) was originally created by Dr. Avi Sadeh and has been completed on over 150,000 infants and toddlers.  It has been expanded and revised from its original form and has been widely used in studies throughout the world. An age-based norm-referenced score has been developed.  These norms are currently based on US data, with the intention of development of norms in other countries (see section below on translations). Scores are available for children from birth through 36 months of age. (author abstract)