Literally translates to "time giver". It refers to the stimulus that entrains biological rhythms. Light is a powerful example. 

University of Rochester

A shift in the activity of a biological rhythm, typically provided by a synchronizing environmental stimulus. 

- Zeitgeber

Phase Shift

The process of synchronizing a biological rhythm to an environmental stimulus. 

- Zeitgeber

Entrainment

Ongoing family conflict and disorganization can promote unhealthy coping mechanisms and chronic stress, which can lead to high BMIs, inflammation, and irregular heart rate variability. Parents' physical and emotional presence can change children sleeping patterns. Parents mediate hypertension risk in their children by:

• Being a zeitgerber, or an environmental cue and regulator of sleep. 

• Providing enough emotional security for deep sleep.

• Concordance in sleep schedules, or synching parental sleep routines with children routines.

How Family Dynamics Contribute to the Onset of Hypertension

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

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