Breathing mask

A breathing mask comprises:

• an eye covering comprising an opaque material, defining an eye region configured to extend over both eyes of a user wearing the eye covering, and defining a nose region configured to extend over a nose of the user;
• a strap configured to retain the eye covering on a head of the user with the eye region over both eyes of the user and with the nose region aligned to the nose of the user;
• a flow control module coupled to the nose region of the eye covering, defining a manifold, comprising a nostril junction fluidly coupled to the manifold and configured to mate with nostrils of the nose of the user, and comprising an outlet port fluidly coupled to the manifold;
• an inlet check valve fluidly coupled to the manifold and configured to open in response to a decrease in air pressure inside the manifold;
• an actuator operable over a range of positions between a minimum-restriction position and a maximum-restriction position, the actuator minimally restricting airflow out of the outlet port in the minimum-restriction position and maximally restricting airflow out of the outlet port in the maximum-restriction position;
• and a
• a controller configured to trigger the actuator to transition from the minimum-restriction position toward the maximum-restriction position in response to transition of the user from a wakeful state to a sleep state.