2. Heightened Mood
Healthline.com explain that sun and darkness trigger hormones in the brain, specifically serotonin in the case of being outside in the sun. Serotonin is associated with a positive mood, and many antidepressant medications focus on retaining levels of serotonin in the brain.
Meanwhile, sunlight can help alleviate the symptoms of seasonal affective disorder (SAD), a mild form of depression that strikes many people in the colder months, when the days are shorter and they see the sun less often. The same source also says sunlight can have benefits for patients with non-seasonal depression, as well as help manage anxiety and panic attacks (which have also been linked to reduced sunlight).