I think RTA may mean Road Traffic Accident.

AIM,

I think you may be having seizures during sleep that prevents your brain from properly storing short term memories from the day before as long term memories. This may be a result of a sleep disorder or poor blood flow to the brain when you are sleeping.

When I have a bad night's sleep, I have similar memory problems. Rather than frustrating anybody, I just accept that I don't remember much of yesterday.

There may be other things at play. Tell us more about your injury and ongoing symptoms and we may be able to help more.

My best to you.