Please tell me about relation between obese and apnea sindrom?

Provide methods of recovering

Is there any relation betwee brainfog(a cloudy, unclear thinking/tiredness) and sleep apnea?

Is there any relation between sleep apnea and apple cider vinegar or a normal vinegar ?

does the vinegar cure tiredness or fatigue? If so is it scientifically proven? Is it safe to have vinegar as a regular medicine for tiredness? Thanks