hello I was just curious to know what are the s&s of a conusion? I don't know how to spell it. The reason I ask is because I was at the park jogging and I saw this kids run into a tree. I am not a nurse so I had no idea what to do. I wanted to help so bad but didn't know where to begin. He said he felt nauseas and dizzy. But 10min later he felt fine and left riding his bike. I still feel weird about the whole thing b/c in my mind all I could think is what if he goes to sleep and die! AHHHHHHHH and I didn't do anything. Is this true about sleeping with a concusion could cause you to die. I am so lost can someone plz explain it to me. Thanks