Usage History of 'sleeplessness'

The following chart shows how frequently 'sleeplessness' appeared in printed materials over time. For example, the word 'sleeplessness' occurred 2 times in books in 1727 and 20,214 times in 2008. From 1727 to 2008, the word 'sleeplessness' was used a total of 454,932 times in books scanned by Google. See Reference: Google Ngram project.

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