Set boundaries and leave work at the office. When work continually intrudes on your personal life, quality of life suffers at the expense of your happiness. Activate your assertiveness skills to address unreasonable workloads (as much as appropriate) and demonstrate flexibility by taking breaks, breaking for lunch, and signing off in the evenings and weekends.
Delegate. Harness the power of delegation; assign tasks to your team to alleviate the burden of competing deadlines. Leverage interpersonal relationships to identify those who can help, or those who need exposure or development in a particular task, and use flexibility to ensure fair distribution of work.