Depends: Any pain that has you very concerned should be seen by MD for full exam. The neck muscles may be tense on the left side of neck. Try some gentle neck stretches and a dose of ibuprofen to see if it changes the pain. If there is any tingling down into your shoulder/upper arm with this motion see a doctor soon. Make sure your aren't sleeping awkwardly on excessive or too few pillows.
Answered 9/4/2015
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