René Descartes was a French philosopher, mathematician, and scientist. A native of the Kingdom of France, he spent about 20 years of his life in the Dutch Republic after serving for a while in the Dutch States Army of Maurice of Nassau, Prince of Orange and the Stadtholder of the United Provinces. 1 2 3 4
Descartes suffered from frail health at various points in his life which resulted in him taking more rest than usual. He typically had a long sleep each night, sleeping around midnight till and waking up around 11 am. Upon waking, he'd usually spend time in bed reading, writing, or contemplating. Descartes then liked to have an early lunch and either go for a casual walk or converse with friends.
His schedule changed drastically when he moved to Sweden and began tutoring Queen Christina of Sweden. To suit her schedule, he gave her classes at around 5 am. This change is said to have contributed to a respiratory infection and subsequently his death.
French Emperor and General