It is completely normal for staff to have to work 24/7 for critical services.
Plumbing, HVAC, power plant engineers, doctors, nurses, hospital support staff, taxi drivers, system and network engineers - these people keep our modern world alive, all day, every day. Weekends, midnights, holidays, every hour of every day someone is AT WORK to make sure our society functions.
Not only is it normal, it is essential and required.
It’s ok that you don’t like having to work nights or weekends or holidays. But some people absolutely have to. Be thankful there are EMTs and surgeons and power and network engineers working instead of being with their families on holidays or in the wee hours of the night.