light exposure at night triggers rapid gene activity in the brain's internal clock region
Light exposure at night induces rapid expression of the immediate early gene c-fos in the ventrolateral suprachiasmatic nucleus (SCN), with the duration of this photic induction window being compressed under long photoperiods and expanded under short photoperiods.
What this means for you
Your body's internal clock relies on light signals to stay in sync with the outside world. When light activates this clock region, it helps regulate sleep timing, hormone release, and daily energy rhythms — the kind of behind-the-scenes calibration that affects how rested, alert, and balanced you feel each day.
The published research
From the Pineal Gland to the Central Clock in the Brain: Beginning of Studies of the Mammalian Biological Rhythms in the Institute of Physiology of the Czech Academy of Sciences
Physiological Research · 2024
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