The Diagnosis of a Patient at the Sleep Clinic Reads

The diagnosis of a patient at the sleep clinic reads sleep apnea. What can we conclude about this patient?

A) His sleep is interrupted by breathing disruptions.
B) He begins his sleep by entering REM sleep immediately.
C) During the night, he will awaken abrupt and scream, cry, and fidget.
D) He will grind his teeth while he sleeps, which reduces his sleep as well as the sleep of others.