Training researchers in the administration of the SCISD-R is essential to ensure accurate, reliable, and valid data collection. This semi-structured interview requires nuanced clinical judgment to differentiate between overlapping symptoms of various sleep disorders, such as insomnia, circadian rhythm disorders, and parasomnias. Proper training minimizes variability in administration and interpretation, ensuring consistency across interviewers and enhancing the reliability of study findings. Training also equips researchers to adhere to standardized protocols, fostering an environment conducive to eliciting accurate and comprehensive participant responses. The online training will include instruction on the SCISD-R structure, instruction in DSM-5-TR sleep disorders, and hands-on practice with mock interviews, ensuring fidelity to the protocol. The budget includes costs for access to the SCISD-R, training materials, and training fees.