The Drone.

Tsushima is loud. Not loud with the sounds of humans (though they do play a saccharine tune followed by the morning town announcements on a loud-speaker at 8:00am), but loud with the sound of insects. A general hum pervades the air anywhere near a patch of forest. Clicks and buzzes, some cutting out, others beginning. Thousands of insects vying to make their voices heard in the humid air. Some are doubtless the calls cicadas; the island is home to a plethora of species. Yet there are strange voices too. Whines and taps. As one falls asleep, these thousand different sounds mingle together as the consciousness relaxes control of it's power to differentiate sound. The frequencies (which seems to span the spectrum of sound) merge into one full note as sleep overtakes one.