takin' the pills for it

From the SFGate

Rolling Stones guitarist Keith Richards said the riff in "(I Can't Get No) Satisfaction" came to him in his sleep, while the 19th-century chemist Dmitri Mendeleev literally dreamed up the periodic table of elements.

Now, for the first time, scientists say they have proved what creative minds have known all along: that our sleeping brains continue working on problems that baffle us during the day, and that the right answer may come more easily after eight hours of rest.

(more at the link above)