When I don't get enough sleep, I feel physically and mentally heavy. I feel as if I can't understand what is being told to me in lectures or in simple conversations with friends. My body feels extremely tired all the time. During the swim season, I felt as if I was getting a sufficient amount of sleep -- going to bed early enough to get at least 8 hours -- but still waking up just as tired and sore as I went to bed the night before. I was in a constant sleep debt regardless of how much I slept at night and if any naps were taken during the day. Along with these issues, I would also get irritated more easily at people when they would do the smallest thing to annoy me. These would be things that wouldn't typically annoy me if I had gotten enough sleep.