1. The blatant use of disruption to keep a group or individual from falling or staying asleep.
2. To cause disorder in one's circadian rhythm as a result of direct or indirect obstreperous actions.
John: Hey Steve, are you alright? You look like hell...
Steve: Not really man, I was up all night studying for finals. I finally went to bed around 4:00 AM only to be awoken at 7:30 AM by an act of circadian terrorism.
John: What do you mean?
Steve: Well, my neighbor seems to enjoy hiring bands of workers to stand outside my bedroom window before the crack of dawn and hammer things.
The circadian rhythm is the cycle that dictates what your body does when: secretions, sleep, awake, temperature fluctuations, etc; but most importantly, when it does those things.
A circadian backflip is something shift workers and people stuck on night shift experience, when they wake after dark, and go to sleep after dawn.
Person 1- "Where's Cornelius lately? I haven't seen him in months!"
Person2- "Me neither. Since he started his new job he's had a full-on Circadian Backflip. He looks just like Bela Lugosi now!"
A type of birth control in which one partner drugs the other with a sleeping pill prior to sex, with the intended effect that such person will fall asleep prior to ejaculation. This method is even less effective than the rhythm method and is not recommended.
"We're out of condoms, but it's no problem... I've got enough ambien for us to use the circadian rhythm method."
"Well, she's not on THE pill, but she's on A pill... circadian rhythm method style."
"No, I'll take my coffee black, I really can't have milk at this time of the day. I just got diagnosed with C.L.I, better known as Circadian Lactose Intolerance.