Answer:
#1
Sea breeze part
When the land gets warmer in day time the warm air goes up
To fill the free space created underneath the middle atmosphere cold air breezes from ocean surface towards land to fill up the free space .
This is the reason why humidity remains at peak during day time on beach sides
#2
Land breeze part
In night time the opposite of day time appears ,the ocean surface gets warmer.
The warm air rises up
To fill up the free space cool air from land surface goes there .
Humidity remains less so we feel chill during night time