Sleepy Dust

I have known persons who have never indulged in a second sleep. One gentleman, who entertained a notion that a second nap was injurious, invariably got up as soon as he awoke, no matter how early the hour — winter or summer.
-William Wadd. "Eating, Drinking, and Sleeping." Quarterly Journal of Science VIII 1828

It was his custom to go to bed early after a light supper, and rising as soon as he awoke from his first sleep, about the time that monks say their matins, he wrapt his head in a kind of cowl, and spent four hours in deep study.
"Aimar de Ranconet". William A'Beckett's Universal Biography, 1836

source

segmented sleep