I want to be rude.

Is it rude to tell a friend of the family that I work nights, therefore sleep days, and that calling at 1:30PM is the rough equivalent of calling at 1:30AM to the rest of the world?

One call, fine, sure. But five? Letting it ring until I get up to answer it and then hanging up at the machine?

Or would it be ruder to simply wait 12 hours and return the call in such a manner to wake up both of her children?