European Respiratory Society Oct 29 2025 During heatwaves, there is an increase in the number of people suffering with obstructive sleep apnea (OSA), according to a major study published today (Wednesday) in the European Respiratory Journal . People with OSA often snore loudly, their breathing starts and stops during the night, and they may wake up several times. Not only does this cause excessive sleepiness, but it can also increase the risk of high blood pressure, stroke, heart disease and