Nozovent widens nostrils so that airflow is increased through the nose. When worn at night Nozovent significantly reduces or stops snoring, sleep apnoea, and nocturnal asthma. Nozovent is a non-invasive, reusable soft plastic device clinically proven to improve sleep for snorers in over 70% of patients. Bjorn Petruson, Snoring Can be Reduced when the Nasal Airflow is Increased by the Nasal Dilator Nozovent, 1990 Nozovent widens nostrils so that airflow is increased through the nose. When worn at night Nozovent significantly reduces or stops snoring sleep apnoea and nocturnal asthma.