Here is a photo of my Hobie at dock in the morrning. It has been secured like this over the night waiting for the wind to fill in on the bay. Unless there is a storm or weather front coming in, it is always calm at night. Then the warm air of the day will create wind on the bay. A morning like this tells me it is going to be a good day for sailing. The prairie to the west will heat up and draw the cool air of the bay. That will make a nice "sea breeze" on the bay. Perfect for sailing.
Usually I'll bring the Hobie cat up onto the beach if I think there will be weather at night, as the waves coming in can be like the ocean here. But I knew it would be calm all night. I know this lake so very well.