My family treats my night-shift schedule like a bad habit

I work four overnight shifts a week at a distribution center. I get home a little after 7 a.m., eat something, shower and usually sleep from about 9 a.m. until late afternoon. This schedule is not mysterious to anyone in my family. It has also not stopped them from treating noon as a reasonable time to call.

My mother opens with, “Were you still asleep?” in the tone people use when they discover you missed an appointment. My brother schedules birthday lunches for 1 p.m. and says I can just go to bed earlier that day. A friend recently suggested that I would feel better if I stopped “sleeping the day away.” She meant it kindly. I still wanted to hand her my safety vest and ask her to report for work at 10 p.m.

The constant explanations are wearing me down more than the invitations. If I decline brunch, I am antisocial. If I attend, I spend the meal doing cheerful arithmetic about how many hours remain before my next shift. On my nights off, relatives expect me to switch immediately into a daytime schedule, as if my body were a wall clock with an easy reset button.

I have contributed to the confusion. My phone is not consistently on Do Not Disturb because I worry about missing a genuine emergency. Sometimes I answer a noon call, which teaches everyone that calling works. I also say, “I was napping,” instead of, “That is the middle of my sleep.” The first phrase makes the interruption sound optional.

I do not need my family to understand every detail of overnight work. I need them to stop treating my sleep window as available time. I am thinking of sending one clear message with the hours I am unavailable, plus a rule that repeated calls mean emergency. Social plans could rotate instead of always requiring me to absorb the schedule change.

How would you set this boundary without turning every invitation into a lecture? And for households with one person on nights, what practical arrangement protects sleep while still leaving a route for something truly urgent?