At the center of your brain, a clump of nerves—called the suprachiasmatic nucleus—oversees your body’s clock: the circadian rhythm. It determines when you feel sleepy and when you feel bright-eyed. It controls your blood pressure, your body temperature, and your sense of time. It turns your body into a finely tuned machine.I definitely believe the part aboutsometimes waking up when you know what time you need to be up. I've pretty much never slept until my alarm goes off on a day when I'm leaving for vacation, even if I'm getting up a couple hours ahead of normal in order to catch a very early flight. That always seemed weird to me, but I guess I understand why it happens, now.
That machine happens to love predictability. Your body is most efficient when there’s a routine to follow. So if you hit the hay the same time each night and awake the same time each morning, your body locks that behavior in. And that’s where things get sciency.
Sunday, December 8, 2013
Why Do You Wake Up Before Your Alarm Clock Goes Off?
Because your brain wants to wake you up on its schedule: