circadian (thing) by Eraser_

circadian: fluctuating regularly on a time basis usually entrained to a metabolic, endocrine, neurochemical, light-dark, temperature, or seasonal cycle (see also diurnal, ultradian). There are very fast biorhythm cycles such as in the EEG and ECG, a 90-minute cycle seen in REM-NREM sleep or in waking attentive/alert-drowsy/inattentive swing, a twice daily body temperature peak and slump. a 24-hour ACTH cycle, a monthly menstrual cycle, and possibly longer seasonal cycles not yet thoroughly described.

Dictionary of Sexology Project: Main Index

Circadian rhythm	The beer bong calculus problem	memento mori	Biological clock
Only at Chuck E. Cheese's, in the small hours with a gun in my hand, do I feel truly alive	garden clock	schizophrenia	Ken Curtis
The ESP Game	John Adams's 1798 State of the Union Address	Buying eggs	George Washington's 1790 State of the Union Address
abbr	Notelet Nodelet Squawkbox Client	circadian clock	Metric time
Foramen magnum	Editor Log: October 13, 2000	infradian	ultradian
Old-Time Linguistics	if music were a woman