Bang or No Bang?

Either my head has become numb or i'm just getting used to it.

I woke up in the bus and i wasn't sure if i had just banged my head on the window again. I'm sure i heard a bang but it didn't feel like one. I looked at the glass. I looked at myself. My head doesn't really feel like it had been hit. But then, where did i hear that bang from? Am i imagining it? Maybe i was dreaming. Maybe i got immuned to all the hitting.

I feel like i got abused in the bus.