Hi V.,
Here are some of my thoughts...
You could try to lie down on the floor with him, in fact have the whole family lie on the floor and interact, but don't do it with the intention to get him on the floor, just have a good time and have fun and let him watch. If this is the ticket, then you may have to do a several times, let him come to you to play.
He may not be feeling well, His abdomen may have pain, he could be extremely sensative to smell, dust, and texture. If this is true, if he is very sensative, that could mean his nervous system is overloaded, and the floor just makes it very uncomfortable for him. A note of concern if this is true, these kind of sensativities show up when there is toxic overload in the childs body. (heavy metal from moms body, vaccinations, medications, flue shots) This is an accumulitive problem. You can get his blood and hair tested easily for metals.
Check in with the environment, is it very loud, tv on alot with him around, lots of chaotic energy.
lastly, and this is just me, this is not time for mommy to be a full time student, learning to be with her baby and caring for a child is better than any degree one can get from a University. Maybe it is his way of expressing something he has no other way of telling you he wants his mommy.
Good Luck and Take Care
S.