I am grateful to having had a good neurologist way back in 1970 who told me to stay away from alcohol, that my concussed brain would not tolerate it.

The research is sparse except for the research that says a single drink per day may be OK.

Think of it this way. A hang over is like PCS. The brain is responding to getting assaulted with a chemical impact. It is having a reaction to the toxicity left over from the drunk period.

I tried one glass of beer while in college. It alone left me hung over the next day.