Does snoring break your wudu?

The ruling on snoring depends entirely on what the snoring indicates about your level of sleep. Wudu is broken by anything that exits the private parts, and the concern with sleep is that a person may pass wind without realising it. Therefore the question is not "did I snore?" but "was I sleeping deeply enough that I would not have noticed?"

The majority position (Hanafi, Maliki, Shafi'i, and Hanbali in their strongest opinions) is that deep sleep — sleep where you have lost awareness of your surroundings — breaks wudu. Audible snoring while lying down on your side is generally considered evidence of deep sleep. A brief doze in the sitting position with your bottom firmly on the ground typically does not break wudu, since wind could not pass without you noticing.

Practical guideline: if you fell asleep in sujood, on a couch, or lying down — and you snored — renew your wudu before praying. If you nodded off briefly while sitting upright (e.g. dozed during a lecture), most scholars say your wudu remains.

When in doubt, simply make wudu again — it takes a minute, and the Prophet ﷺ said: "Wudu is the key to prayer." Renewing wudu carries reward of its own.