. "- The mask leaves a red mark on your face, or does not feel comfortable. - Your mouth feels dry when you wake up in the morning. - You feel congested, or have a dry or sore throat in the morning. - You start to feel tired during the day. - You fall asleep during the day, during normal activities such as while watching TV or reading. - Your eyes feel irritated from air blowing on them all night. -" . . . . .