A small admissionWhenever I read about, think about, hear about or otherwise register the term
circadian rhythm, I always think of an insect called the
cicada rather than what the term "circadian" actually means.
The etymology of "circadian" is in the
Wikipedia entry, but to save you time:
Latin circa (about) + dies (day) = about/approximately a day. The circadian rhthym is the cycle of processes our body undergoes approximately every 24 hours.
If any of you have lived a somewhat rural summer life where giant cicadas sit motionless on trees for hours on end and just...hum, you'll understand why I associate "rhythm" with "cicada" rather than "circadian".
While this isn't the exact species I used to hear out my window during Illinois summers, cicadas sound something like
this. If the little bastards weren't so grotesque, it'd be like a lullaby.
D