David R. Samson

Millions of years ago, when we were shorter and hairier and, well, let's just say it, not too far removed from chimps, a night of uninterrupted sleep was impossible to come by.

Millions of years ago, when we were shorter and hairier and, well, let's just say it, not too far removed from chimps, a night of uninterrupted sleep was impossible to come by

Millions of years ago, when we were shorter and hairier and, well, let's just say it, not too far removed from chimps, a night of uninterrupted sleep was impossible to come by.

Millions of years ago, when we were shorter and hairier and, well, let's just say it, not too far removed from chimps, a night of uninterrupted sleep was impossible to come by