The Act of Creation
... Einstein has reported that his profound generalization connecting space and time occurred to him while he was sick in bed. Descartes is said to have made his discoveries while lying in bed in the morning and both Cannon and Poincaré report having got bright ideas when lying in bed unable to sleep ... It is said that James Bradley, the great engineer, when up against a difficult problem, would go to bed for several days till it was solved.


