I really hope that he is not getting sick

I took Nate to gymnastics tonight and he got mad and hit me. Hitting in an ongoing battle at our house. I took him home and put him in timeout and told him that he could not have his special treat since he hit. He had a total meltdown! Hitting, kicking, headbutted, threw stuff. I have never seen Nate so upset. I went in there and held him and he asked for the duckies. He laid on top of me with the duckies and was asleep in five minutes. At 7:oo pm! And, he slept for 13 hours! He has never (in his life) went to bed at 7 or slept for 13 hours. He has never been big on sleeping. I really hope that he is not getting sick right before Christmas!