Cool breezes at night caused by difference in heating and cooling rates of land and water?

A Sea breeze. It is caused by the hotter air over the land to rise, Thus the cooler air over the ocean (or any LARGE body of water) rushes in to replace the hot rising air. It's like a vacuum affect. At evening, when air over land cools, the sea breeze will dissipate and the prevailing wind will take over.