I came from a family that didn't flush liquids overnight.....Old house, really rattly pipes, not so sound sleepers. We flushed any solid waste and anytime any lady of the house was "indisposed". We immediately flushed in the morning, and whenever we had guests.
As an adult with a home of my own, I pretty much kept to the same pattern, and still do similar. However, when I am a guest in someone else's home, I follow their lead.
But please, can we keep the avoid the disgusting and unhygienic labels that get thrown at posters whom we don't agree with whenever these topics come up. I grew up with a parent that still lived on a farm with an outhouse and chamber pots for overnight use....and I'm only in my 30's. So that also plays into how I was raised.