Can Snoring Be A Sign Of Multiple Sclerosis Is The Onset Of Snoring A Reliable Indicator That One Is Entering A Particular Sleep State?

Is the onset of snoring a reliable indicator that one is entering a particular sleep state? - can snoring be a sign of multiple sclerosis

Assuming that no examples of severe sleep apnea (the sequence may appear multiple times if this were the case), then I assume that they enter REM sleep about 90 minutes after the start of snoring?