Time spent in outdoor light is associated with mood, sleep, and circadian rhythm-related outcomes: A cross-sectional and longitudinal study in over 400,000 UK Biobank participants

Research on over 400,000 people showed that for every extra hour spent outdoors during daylight, you are more likely to be happier, and have a lower likelihood of depression and antidepressant use.

The circadian rhythm is more balanced, making you less tired and have less insomnia.