I always have a small window open in the bedroom at night.
I'm currently looking at a bungalow. I love the layout and the location and with one eye on the future it seems sensible to make our next home, as we approach retirement, single storey, just in case.
It's a beautifully modernised and extended bungalow and what was once the dining room is now a bedroom. The only window in that room is french doors, so you can't have a window open without leaving a door open. I'm not happy with that but easy enough to change.
However, it got me wondering whether I'd be comfortable with any open window in a ground floor bedroom, not helped by the fact that there are no fan lights, all the opening windows are "big"
Do you sleep on the ground floor with an open window?