We got to that period again when for no apparent reason she will sleep with the children. It is a cyclic event that repeats itself every few months. I'm left alone on a king sized bed with a 5 foot tall stuffed killer whale bought at seaworld.
After so many years, I no longer do any research as per why this happens. I just accept the fact that it happens for no apparent reason and wait it out.
This period also comes with a 'silent treatment' that starts in the morning and last throughout the day, with occasional breaks to inform me about the child's needs (we need more milk, more diapers, etc). At the far side of her mood cycle, there's the chatty period, where she just can't stop talking. I'm not sure witch one is worst.