Add Yahoo as a preferred source to see more of our stories on Google. Have you ever felt like your life is ruled by the clock? Well, it actually is -- but it's not a clock you can see. The circadian ...

YOU HAVE TO SLEEP AT THE RIGHT TIME. MINDY: IT IS VERY HARDWIRED. WE FOUND OUT THAT EVERYTHING SLEEPS AND EVERYTHING HAS A CIRCADIAN RHYTHM TOO. IT’S AN INTERNAL CLOCK. OUR BODIES ARE HARD-WIRED BY ...