What Could Cause Sudden Numbness Felt At The Back Of The Head That Made My Tongue Numb For A Moment?

I sat a lot in front of the computer and one day my friend called me to play a game. I ran. I ran my head while I ran and felt as if a nerve had cut off my neck and numb the back side of my head and paralyzed my tongue for a second and then everything went back to normal.