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As someone who not that long ago had a fall and suffered a minor head injury, I could totally believe this story.
I felt fine at the time, and even after cleared by ER for precautionary checks/scans.
Everything seemed a-okay, but the next day (and for 2 weeks after) I was still having minor concussion symptoms. General haziness, a bit slow on the uptake, lethargic, not quite "myself", slightly dizzy if stood up too fast.
The paperwork they give you at ER when discharged for minor head trauma states it can take up to a month to fully recover, and symptoms can come on 24-48 hours after a head knock.