I also know of a case where a mother with three kids working part time and supposedly studying, had her children both in daycare (creche) during the day and overnight family daycare. The o/n care also extended to the weekends.
There were kids that would stay for up to five or six days full time with Mum due to circumstances with their families (24/7) to stop them having the stress of swapping locations during the day. there were a couple with cerebral palsy that would often stay two or three nights in a row. it was safer for them to be at our place (yes, i was personally witness to the way their dad treated them - and i suspect the CP came around due to the abuse dished out on their mother while she was pg - definitely safer at our place)