Why did you make me so sore at sparring!?

I woke up today really really sore. Yesterday at black belt class and sparring, I worked out so hard that this morning I woke up sore all over. My neck was tight. My biceps and abs were tight. My feet and legs were sore. Every muscle in my body was hurting. Even my face was sore because during self defense I accidently got punched in the face by my partner. SO yeah. All of today I was sore and probably am going to be sore tomorrow.