Hello, Thanks for your query. Chocking in sleep suggests sleep apnea in which patient has difficulty in breathing due to obstruction in airway by soft tissue or brain fails to send signals. Beside that cardiac arrest or stroke can also chock the patient. In all cases brain may starve for oxygen leading to fits and coma. It can be very difficult to predict recovery when a person is a coma. Every person is different and it is best to consult with your doctor. Patients in coma may yawn, chew, swallow, and (in rare cases) make guttural noises.All these are all reflexes mediated at the level of the brain stem—not the brain cortex. So it is difficult to judge the recovery. Hope He will get well soon. Take Care!