I WFH and sometimes I have to find somewhere else to work for a day. It turns out that there are two websites which offer day rooms at regular brand-names hotels (like Hilton) and it's usually much cheaper than paying for an overnight. Plus you can have the room all day, instead of being hampered by check-in and check-out times, meaning that you wouldn't get a full day if you booked an overnight.
I don't have kids, but if I did, and I felt exhausted, and just wanted a day of rest by myself, I would book one of these. And if this wasn't acceptable to the tribe at home, I would make out that I'm spending the day doing Good Mum stuff, like Xmas shopping. Then I would go and have a truly marvellous day of relaxation being completely alone.
I just thought this might be a useful resource, after someone posted about how tired they were as a parent. The websites are dayuse and hotelsbyday. Obviously, availability is highly dependent on where you're from.
Hope this helps someone!