Does sleep apnea and excessive snoring go hand in hand?

There is a general notion that sleep apnoea is a condition which has snoring as its key symptom.This is false as I have seen patients with sleep apnoea who dont snore and the other way round.Sleep apnoea is diagnosed not by detecting a snore but by clinical presentations like increased daytime sleep/drowsiness,headache,inab... to concentrate in work(all as a result of disturbed night rest).It is diagnosed by a Sleep study where the individual is attached to a dozen electrodes in different parts of his body(like ECG for heart,EMG for muscle,EOG for eye movements,EEG for brain activity and so on),and his sleep is monitored in a sound proof room.The diagnosis is made after the electrical waves are read.
Snoring is an important part of sleep apnoea but not an invariable one.
I am a chest physician and have conducted sleep studies in lots of patients.

Does sleep apnea and excessive snoring go hand in hand? Keyword

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