daytime light pulses activate fewer inhibitory brain-clock neurons than nighttime exposure
Light pulses during the subjective day induced a significantly lower percentage of inhibitory SCN neurons compared to nighttime, reflecting time-dependent differences in population-wide light response patterns in the hypothalamic master clock.
What this means for you
Your internal body clock — the one that governs sleep, energy, and hormone timing — responds differently to light depending on the time of day. Understanding this helps explain why morning light exposure tends to sharpen alertness and support healthy sleep cycles, while light at night can disrupt them.
The published research
Discrete photoentrainment of mammalian central clock is regulated by bi-stable dynamic network in the suprachiasmatic nucleus.
Nature communications · 2025
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