#Why??
Why are the waves higher at night?

Light and heat from the sun causes the water to warm up and evaporate causing air currents which in turn changes the frequency of the waves. The divergence of heat absorption of the land and the ocean courses a temperature difference which in turn causes large masses of air to flow and change the wave size and frequency. At night when the temperature somewhat equalizes the wind dies down the waves mellow out and the frequency changes. Now by earth standards these are local effects. You need to study the major air currents and the colories effect of the earth spinning has on global wave currents and air flow