It might be hard for you to determine whether you have a problem with sleep apnea, considering that you are asleep when the issues are happening. However, there are still a number of clear symptoms that are telltale signs of sleep apnea. These symptoms include loud snoring, periods where you stop breathing during sleep, waking up in the middle of the night with shortness of breath, waking up with a dry mouth and sore throat, headaches in the morning, insomnia at night, excessive drowsiness during the day, trouble paying attention, and general irritability.