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We know that seasonal changes in the amount of daylight we get can have a significant impact on us – such as Seasonal Affective Disorder (SAD), for example.
Neurons in the suprachiasmatic nucleus coordinate to adapt to different lengths of daylight, changing at cellular and network levels. The neurons changed in mix and expression of dopamine, altering brain activity and subsequently daily routine behaviors.
Seasonal changes in light -; longer days in summer, shorter in winter -; have long been associated with human behaviors, affecting everything from sleep and eating patterns to brain and hormonal activity.