Well it does, who would deny it. Humans relationship with sunlight is very complex.
Its been very noticable over the past week of fairly good weather how the nations mood has lifted.
This article by Healthline is quite good reading.
https://www.healthline.com/health/depression/benefits-sunlight#benefits
Double edged sword of course, exposing yourself to Uv does raise your chances of getting skin cancer’s, and that can be sort of quantified. The benefits are a little less clear cut. But I will ask.
1. Do you feel better when its a nice sunny day?
2. Is your mood improved even by a short period sitting in the sun.
3. Do you feel more productive and less tired on fine sunny days.
Seems sunshine is the X-Factor, because its three yes’s from all of us.