The “put your own oxygen mask on before assisting others” airplane instruction is a strong example of how we can best be of service to others. The analogy applies to unrelated and non-urgent scenarios.
Sick, sleep-deprived moms won’t be their best selves. “Selfless” people who donate all their money are promptly in a position where they can no longer help anyone.
Drowning people make lousy lifeguards.
Caring for your own well-being is a prerequisite for being useful to those around us.