I'm a beginner and had some weak head kicks in sparring, basically a foot slap or a big toe on my head; but no power at all, and I encourage partner to kick me in the head because i need to learn! There is a mile of difference between getting a controlled kick and a follow through heel or shin to the head.
To be honest, I am more worried about getting a toe in my eye in the dojo. This is why short nails are mandatory in the dojo.
In competition rules, knock down, you get knocked out no more than every 3 months at least
European knockdown rules..
"1.5 If a fighter loses by K.O. to the head and is declared unconscious by the tournament Doctor it must be recorded in
their European passport and they canāt compete again for at least 3 months or decision by the tournament doctor.
The competitors will be judge according to the EKO Medical Tournament Rules."
I presume some similar rules are in boxing or mma?