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. 2021 Feb 1;17(2):177–184. doi: 10.5664/jcsm.8810

Figure 1. Google search queries for the sleep-related terms between 2004 and 2019.

Figure 1

Google search queries worldwide (A) and in the United States (B) for the search terms “insomnia,” “sleep apnea,” “restless legs,” and “narcolepsy” between 2004 and 2019. There were significantly more search queries for “insomnia” compared to the other 3 sleep disorders worldwide (P < .0001 for all comparisons, log-transformed data) and in the United States (P < .0001 for all comparisons, log-transformed data). There was also a significant increase in search interest for “insomnia” starting from 2009 worldwide (P < .0001 for all comparisons) and from 2011 in the United States (P = .0015 for 2004 vs 2011; P < .0001 for all other comparisons).