unirytmeihin
Unirytmeihin is a term used in sleep science to describe the study or process of aligning the body's sleep-wake rhythms with external time cues, particularly the light-dark cycle. The word is formed from the Finnish components uni (sleep) and rytmi (rhythm), with the suffix -in indicating movement toward or immersion in the rhythm. In literature it is sometimes used to discuss circadian entrainment or rhythm alignment as it applies to individuals or populations.
Conceptually, unirytmeihin encompasses how the circadian clock in the brain integrates zeitgebers to orchestrate sleep timing,
Methods to study unirytmeihin include actigraphy, sleep logs, measurements of dim-light melatonin onset, core body temperature,
Limitations include individual variation in chronotypes, environmental factors, and the challenge of distinguishing causation from correlation
See also: circadian rhythm, circadian entrainment, jet lag, shift work, sleep hygiene.