Thanks.
In short, you parked where permit parking only was allowed. Your only reference to why you parked where you did, as opposed to why you parked, is in your posts:
For safety reasons I stopped as soon as possible, as I was afraid to cause an accident. I turned for about 3 mn and in that condition this is the safest place I could find, I wasn’t even in a condition to look at signs.
You would have to flesh out how you ended up where you did as being 'as soon as possible' having regard to your route home from work.
I still feel that there are 2 issues here:
Why you parked in contravention;
Why, on seeing your car in contravention with you inside but not in a conscious state(whether asleep or not), the CEO simply issued a PCN and then left(fled) the scene without enquiring about your health.
IMO, you need to put both points to the authority in the same reps but clearly separated.
From the Secretary of State's Statutory Guidance to which councils must have regard and develop and publish policies:
Enforcement authorities should provide enough staff for the volume of work. They should also make sure that those staff (whether employed directly by the authority or by a contractor to deal with informal challenges) have the skills, training, authority and resources to give the public a high quality, professional, efficient, timely and user-friendly service.