Security guards are lazy at night?

I think it's understandable that security guards are lazy and don't sleep at night, because their night shift is too long and it takes one night. In this process, they will look for leaves in advance and wake up in the middle to check, so the rest of the time is boring and they can sleep, otherwise people will be very tired. As long as you are worthy of your salary and there is nothing wrong, you are excusable.