Opening the window, even just a little bit, before you go to bed will change the air temperature of the room. But will it help you sleep better?

A good night's sleep, with no waking up in the middle of the night, can be best achieved at a temperature of between 60°F and 67°F, according to experts.

Does that seem to cold? As you sleep, your core body temperature decreases by as much as 3°F between the hours of midnight and 4 a.m. This natural process is called thermoregulation.

So, opening your window on a cool night could help you sleep better, and give your air conditioner a break. Just make sure it's not too humid outside.