The annual impact factor for the Journal of Clinical Sleep Medicine has risen again, according to Clarivate, which announced on June 30 the release of the 2021 update to its annual Journal Citation Reports. After reaching a new high of 3.586 last year, the JCSM impact factor rose to 4.062, and its 5-year impact factor also rose from 3.952 to 5.255.

The new update is based on 2020 data compiled from the Web of Science Core Collection, comprising more than 20,000 journals in the sciences, social sciences, arts and humanities. The impact factor “is a measure of the frequency with which the ‘average article’ in a journal has been cited in a particular year or period,” expressed as a ratio between citations and recent, citable items published. Similarly, the 5-year impact factor is calculated by combining the statistical data available from consecutive years as a ratio between one year of citations and five years of articles.

The Journal of Clinical Sleep Medicine, the official publication of the American Academy of Sleep Medicine, celebrated its 15-year anniversary in 2019. AASM members can contribute to the journal by submitting a manuscript or volunteering to be a manuscript reviewer.