Every morning, this 16-year-old girl woke up, still thinking the date was June 11, 2019

Having to relive the same few hours every day sounds like a living nightmare, but for an Illinois teen it was no dream.

College student Riley Horner suffered a traumatic concussion while at a school dance, and despite initially her family being told by doctors that she was okay and subsequently discharged from hospital, it became clear that the then 16-year-old was far from okay.

Riley, now aged 21, had woken up every morning since June 11, 2019, under the impression that it was still June 11, 2019, and that she had a big dance to get ready for that night.

The partygoer was enjoying her time on the dance floor when all of a sudden, a teen boy who was crowd surfing came crashing down on her.

Within just a few hours of leaving the hospital, Riley’s health rapidly deteriorated as she had a series of 30 to 45 seizures, mom Sarah explained.

The following morning, it came apparent to Riley’s family that something was up as she couldn’t recall any of the traumatic events that unfolded the previous night – in fact, as far as she was aware, she had to get ready for the dance as it was still June 11.

Things only got worse from there, in the days that followed her memory began resetting to that same date every two hours