That doesn’t mean you’re doomed to wake up in a daze because you’re prone to mouth breathing when you sleep. “Even if you don’t have sleep apnea, or you have mild sleep apnea, opening your mouth makes it much, much worse.”How do you know if you’re mouth breathing at night? How to stop mouth breathingWhen Nestor blocked his nose for science, he experienced an extreme version of mouth breathing. If you’re tackling your nighttime mouth breathing, Park suggested you start by taking care of your nose to minimize congestion. But even if you get your nose to clear, nighttime mouth breathing can be a hard habit to break.

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