Sleepy businessman yawning in the office https://www.rawpixel.com/image/2331280/premium-photo-image-fatigue-yawning-tired-businessmanView licenseA hospital ward for insomniacs. Pen drawing by G.E. Studdy, 1910. https://www.rawpixel.com/image/13979720/hospital-ward-for-insomniacs-pen-drawing-ge-studdy-1910Free Image from public domain licenseMen around a table yawning. Etching by T.L. Busby, ca. 1826. https://www.rawpixel.com/image/14003167/men-around-table-yawning-etching-tl-busby-ca-1826Free Image from public domain licenseVijf predikende geestelijken (1789) by anonymous, George Moutard Woodward and William Holland https://www.rawpixel.com/image/13766563/image-paper-cartoon-faceFree Image from public domain licenseBoer War: soldiers in camp at Bloemfontein being provided with tea as they awake. Halftone, c. 1900, after R. 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