Freeze!!!! A squirrel laid down on the ground. Who knows why squirrels are lying on the ground?

One day I saw a squirrel lying on the floor.
I don't know exactly why a squirrel is lying on the floor. Anyone know?
The squirrel in this video is the eastern fox squirrel.
The fox squirrel is the largest species of tree squirrel native to North America.
This squirrel is a little plump but very cute.