What are cool breezes at night caused by differences in heating and cooling rate of land and water?

When land adjacent a water body heats up during a summer day it does so faster than the water so that there will be rising air above the heated land known as thermal lift. On a hot day a vacuum is thus created at ground level and replacement air must be drawn in at the surface and from the water body as well. The air being drawn in from the sea is called a onshore wind or 'seabreaze' At night when the land cools down, the air above the land mass will also cool down and in fact will begin a slow decent. At night then there will occur a land breeze as the cool descending air mass dissipates at ground level being pushed in every direction outwards. Some of that falling air will travel horizontally seaward toward the adjacent water body causing an 'offshore wind' and this occurs generally at night.