What is conncussoin?

Answer 1

A concussion is a head injury in which the brain is shaken up to the extent that it bangs against the side of the skull.

The most common symptoms are headache, nausea, vomiting, and loss of balance or coordination. Concussions are complicated, because, like any brain injury, there's a plethora of neurological symptoms people could experience. Some people even experience post traumatic seizures, though these are rare.

There's a common misconception that it's vital to keep someone with a possible concussion awake, but this is untrue. You should let them sleep, the body repairs itself best that way.