This is weird! We were having this conversation less than a week ago, with our daughter and fiancé. We have started flushing more since we got new toilets that put a beaker full of water down. Even the long flushes are too short most of the time! However, for the last thirty years, we’ve been very diligent about our use of water, only flushing straight away if it’s brown?! because of droughts etc. Usually what happens at night, is if one of us gets up, the other usually wakes, so we flush then. I don’t really like it sitting in the bowl at night, because we don’t have bathroom window open. In the evening, watching tv, we can go several times in the downstairs toilet, but just flush when we go to bed!