LONDON — For centuries, artists and thinkers have been fascinated by the nature of sleep. Aristotle saw it as a subject of teleological intrigue; Goya saw it as a metaphor for ignorance and the ...

Birds and mamals show both deep sleep and REM sleep. Sleep, in part, serves a circadian function in that it is timed to the day/night cycle of the planet. It also involves a homeostatic function in ...

We recently experienced a very special day - February 12th, the 100th anniversary of the founding of the NAACP, and the two hundredth anniversary of both Abraham Lincoln's and Charles Darwin's ...