When working day shift or night shift who has more advantages or disadvantages? who gets more sick?

My coworker who is day shift is complaining that day shift has more workload than night shift. I work as admin assistant in hospital and she said more workload for day shift because more people asking status of patients to her than night shift and is pissing me off because night shift employees get sick more often and is prone to diseases than day shift I know night shift is less overwhelming because less people are going to hospital to ask the status of patients at night but still it depends there are some days I encountered where I think there are always asking the status of patients though out my night shift so I think it depends. I really dont know why my coworker said that
When working day shift or night shift who has more advantages or disadvantages? who gets more sick?
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