Choking is a physical event in sleep for many people who suffer from sleep apnea. The tongue relaxes against the airway in deep sleep, actually stopping normal breathing. However, people who suffer from apnea do not dream of choking more than others.
Choking may be a symbolic revulsion dream or a deprivation dream. Are you choking on food or being forcibly strangled? The source of the food or the food itself may be a symbol for a revulsion you feel in waking life. If you are choking on a hot dog, Dr. Freud will see you momentarily. If someone is choking you, why? It may be that either you threaten them or they are depriving you of what you need to be effective in the home, workplace, or other setting.