Less Sun = More Sadness

Low sunlight means lower serotonin, a brain chemical that controls mood—this can lead to sadness or depression.

What Is Seasonal Affective Disorder?

SAD is a seasonal type of depression, especially common in winter, caused by low sunlight exposure.

Sunlight Boosts Serotonin

Spending time in sunlight naturally boosts your brain’s happy hormone—serotonin—improving mood and energy.

Vitamin D Deficiency Worsens Mood

Lack of sun reduces vitamin D production, which plays a role in mental health and emotional balance.