Last night I threw open the windows to let the cool air in. No fans required.

I love the whir of a fan on a hot summer night, but without the fan I could hear the insect noise, the crescendoing song of katydids, crickets and other creatures of the night.

The room cooled naturally, a simple transference, cool air instead of warm, night air instead of day.

Was that why I slept so well? Probably not. But it must have helped.