Unions play a crucial role in advocating for better work-life balance by negotiating with employers on behalf of workers to secure benefits such as reasonable working hours, paid leave, and protections against overwork. Unions also provide a platform for workers to collectively voice their concerns about unsustainable working conditions and push for changes that prioritize both their professional responsibilities and personal well-being. By organizing workers around common issues related to work-life balance, unions can exert pressure on employers to create healthier workplace environments.