A new study illustrates that the brain’s cerebrospinal fluid pulses during sleep, and that these motions are closely tied with brain wave activity and...
Ok, maybe your grandparents probably slept like you. And your great, great-grandparents. But once you go back before the 1800s, sleep starts to look...
People who prefer to work and play at night may have evolved to possess the so-called “Dark Triad” of psychological traits — psychopathy, narcissism,...