What is Circadian Rhythm?

Ever wonder how all of humankind somehow manages to fall asleep after the sun goes down, snoozing - more or less - all night, and waking naturally at some point the next morning? Sure, some people are ‘night owls’ (why is it always the moody creative types?), but even so, even they usually run out of steam at some point in the wee hours. And what about timezones? Say you travel from Ireland to Australia. You’ll spend the first frustrating couple of nights more awake than you’ve ever been in your life. But then, as if by magic, you’ll adjust - catching up with those lost 10 hours, and getting sleepy when the sun sets over Summer Bay.

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