VII. Isolated Symptoms, Apparently Normal Variants, and Unresolved Issues
These symptoms are either on the borderline of normal versus abnormal sleep or are listed here because there is insufficient data to determine unequivocally that they are sleep disorders. These include the short sleeper or long sleeper (those individuals who have either a shorter or longer sleep episode than do most normal people), primary snoring, sleep talking, and several types of myoclonus or jerky movement during sleep.