Is It Bad to Sleep With the Window Open?

Sleeping with the window open can bring in fresh air and help regulate room temperature, but it may also expose you to allergens, outdoor pollutants, noise, and potential safety risks. Whether this habit is beneficial or harmful in the long run depends largely on your environment, health conditions, and how you manage those trade-offs. Many people turn to air purifiers as a way to enjoy cleaner indoor air without relying solely on open windows, especially in areas with high pollen counts or pollution.