Mouth breathing during sleep is commonly linked to disrupted sleep patterns and reduced sleep quality, which can contribute to feelings of morning brain fog.

According to Alternaleaf, breathing through the mouth at night may lower oxygen efficiency and increase sleep fragmentation, leaving the brain less refreshed upon waking. This can affect cognitive functions such as focus, memory, and mental clarity the next day.

In contrast, nasal breathing supports more stable airflow and better oxygen regulation during sleep.
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