You could see if it might be the Dawn effect by seeing what your Libre reading is in the overnight period in particular if it goes up just before and when you get up and just after or has it stayed at the high level all night.
If people are finger pricking then they may test in bed as blood glucose can go up as soon as they get up, the liver being super helpful in releasing glucose.
As you are still in the recovery phase from your accident that could be partly having an effect on blood glucose.
Have they ruled out any damage to the pancreas that could have been caused by the accident.