This is just a secret confession here, in the anonymity of the internet, and I hope I have enough social skills to disguise my true feelings. Which is of extreme annoyance when child-free people complain about being tired (given there are no aggravating health concerns). (In my social circle at least, people complain about being tired and busy all the time).
The tiredness that comes with managing kids - especially more than one, and especially for lone/single parents of which there seems to be more and more- is just on a different level. Needed to get that off my chest.