Thanks for contacting HCM with your health care concerns You have a cold and have been using alcohol free Nyquil to treat your symptoms. It is possible that the Nyquil has a sugar base liquid and I would recommend switching to a pill. My choice for you would be entex or mucinex. Both of these preparations have the same ingredient as Nyquil but not the extra sugars from the syrup. You sugars maybe also elevated just by the fact that you are ill. During times of stress you bodies ability to cope with sugars during infections goes down and hence increases blood sugars. I would continue to monitor your sugars perhaps several times a day and if they stay elevated contact your medical provider I hope this answers your question. Please contact us again with any of your health care concerns or questions