Einstein slept nearly 10 hours a day. He valued the significance of quality sleep for maintaining his well-being. His sleep routine, though, was out of the ordinary.
He regularly indulged in brief daytime naps, occasionally more than once a day. These quick naps, lasting just a few minutes, were thought by Einstein to revitalize his mental energy and creative thinking.
He felt that these short periods of rest gave him a renewed viewpoint to solve intricate scientific challenges.

"Atoms, Stars, and Everything in Between" 30 Collected Science Essays👇
physicshistory.gumroad.com