Well that didn't last long...
Not sure what happened here, although it seems that statements made by Askew's management did not help.
Some people are highly vulnerable to concussions. Jahvid Best was a potentially great NFL running back but had to retire because every time his head hit a solid object, he would be significanty concussed, and he became more and more susceptible, which is normal. Oliver Askew may have the same issue. Or his concussion may have been a bad one. Bad concussions leave you sensitive to light and unable to sleep.