A large number of psychological studies have shown focusing on positive moments, kindness and good news can increase your happiness and reduce your stress levels.
Here are three recent studies:
Prosocial Behavior Mitigates the Negative Effects of Stress in Everyday Life. Raposa, et al. 2015.
Happy to Help? A systematic review and meta-analysis of the effects of performing acts of kindness on the well-being of the actor. Curry, et al. 2016.
Examining the Pathways between Gratitude and Self-Rated Physical Health across Adulthood. Hill, et al. 2013.