Snoring can be caused by a number of factors, such as the anatomy of your møuth and sinuses, allergies, a cold, and your weıght.
When you doze off and progress from a light sleep to a deeper sleep, the muscles in the roof of your møuth (soft palate), tongue and thr*at relax.
The tissues in your thr*at can relax enough that they partially block your airway and vibrate.
The more narrowed your airway, the more forceful the airflow becomes. This increases tissue vibration, which causes your snoring to grow louder.