the.com/zeitgeber
the alarm clock nobody set — sunlight, meals, noise, all bossing your body around.
means an external cue, like light or temperature, that syncs your internal biological clock to the 24-hour day.
from german for time-giver, coined by chronobiologist jurgen aschoff in the 1950s to describe environmental signals that reset circadian rhythms.
strongest onesunlight, especially bright morning light
without anybody clock drifts to about 24.2 hours
social versionmeal times and alarms count too
jet lag causeyour zeitgebers change faster than your clock