I always sleep with a small fan near my side of the bed. It only has a kind of “white noise” effect which helps me sleep better, and blows the fresh air into my face so i breathe better.
Even in the winter, I have the fan on.
We also have one of the portable AC/heaters in the bedroom, and it has 3 functions, the AC, heat, and plain fan; so we usually have that set for one of its functions, depending on the time of year.
We are now getting into the warmer weather of spring, the time in-between needing heat and air conditioning, which happens in the spring and the fall. This means that most of the time, we do not need either heat or air, and we usually have doors and windows open to let fresh air come through the house.
I have a little window fan in the bedroom window, which helps blow the fresh air into the bedroom and circulate it through the house.