That's because parts of your brain are actually asleep - There's no control center in your brain that dictates when it's time for you to drift off to dreamland. Instead, sleep creeps up on you as independent groups of brain cells become fatigued and switch into a sleep state even while you are still (mostly) awake. Eventually, enough of these groups switch and you doze off.
If sleep were being directed by a control center, the whole brain would respond at the same time. Instead, it behaves like a self-directing orchestra in which most sections are more-or-less in sync, but a few race ahead or lag behind at any given time.
Sleep researcher James Krueger explains why it?s so hard to get up in the morning: "Everybody has sleep inertia every morning. It takes 30 minutes to an hour to recuperate from being asleep" and get all your neuronal groups up and running.
Got insomnia? Maybe you need to smell the roses!
Art credit: freeimages.co.uk
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