Scientific research has shown that an imbalance in neurotransmitters, such as serotonin, dopamine, and norepinephrine, can contribute to the development of depression.

Source: https://www.benzinga.com/markets/cannabis/23/05/32474668/can-you-treat-depression-with-cannabis-its-complicated

The pathogenesis of SAD is unknown, but primary hypotheses about the condition involve changes in circadian rhythm, decreased retinal sensitivity, genetic factors, and dysregulation of neurotransmitters such as serotonin.

Source: https://www.postandcourier.com/aikenstandard/lifestyle/feature-columns/mind-matters-seasonal-affective-disorder-affects-many/article_a3c41b46-cc0c-11ed-8580-839cfff4d7bd.html

These two neurotransmitters promote relaxation and better sleep.

Source: https://doctor.ndtv.com/nutrition/9-reasons-why-you-should-add-pumpkin-seeds-to-your-breakfast-daily-4038751