Where do maids/helpers sleep?

Where do maids/helpers sleep, especially in a HDB flat context?

I grew up in an apartment with an extra room at the back, after the kitchen. That's our maid's room. A good size room that could easily fit a single bed, a wardrobe, a large ironing board and even a sewing table, all with easy circulation ... the room's possibly bigger than some condo bedrooms these days. I remember bringing home stray kittens and hiding them in the maid's room. 


25 years later, we moved to a house, where there was a maid's room after the kitchen too.


But these days, flats and apartments are so tiny. So where do the maid sleep?

The great internet suggested the following alternatives:

• In the kid's room - I guess the sleep cycles for the kid and the maid could be similar, but doesn't a constant lack of privacy affect the psychological welfare of the maid? Also, squeezing an adult and a child into the same room must mean a double-decker/pull-out bed? What about her stuff?
• In the bomb shelter - This option allows for privacy by the bomb shelter wasn't built for this purpose. Ventilation is a huge problem, isn't it?
• In the living room - Isn't this arrangement that weird for the maid and the family? How does the maid rest well by sleeping in the living room?