Thanks for the additional details. Based on your description I think that since you do not have any medical problems, we might be dealing snoring which could be normal for you (as are almost 40 or more percent of people who snore occasionally), or it might be because of:
(a) Some minor anatomical abnormality of the uvula/ soft palate
(b) Obstruction of nose/ nasal septum deviation/ nasal congestion
(c) Enlarged tonsils
(d) Posture while sleeping (especially on lying flat on the back)
(e) Sleep apnea
(f) Slight overweight (with BMI at 25.1)
(g) Large quantity of alcohol consumption/ using sedatives
Please check in with your doctor and get yourself examined thoroughly so that a cause may be found (if there is one). It may help if you could cut down on your weight, try to sleep on a side, reduce consumption of alcohol, and avoid sedatives.
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I hope that this information helps. Best wishes. Kindly feel free to enquire if you have any remaining concerns or doubts and it would be my privilege to try helping you as much as I can.