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
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.