This condition can be simply stated when your breathing process stops and starts in the middle of your sleep. This condition can make you irritable and foggy-headed the next morning, with dry mouth, sore throat, and headache. These symptoms may seem to you similar to flu, a cold, or other conditions. But to be on the safer side, you should visit your doctor for better consultation. Your doctor may also suggest you a sleep study, where he reads your brain activity, heart rate, breathing, and oxygen levels.