I am going to tell you why you might be feeling tired all day despite 7+ hours of sleep. Don't be scared, hai. Have you heard of Old Hag Syndrome? This has happened all over the world and this might be happening to you. You probably don't remember when you wake up, except perhaps for that uneasy feeling. Here's what might have happened. At night when you are asleep, a ghost of an old lady (hence, the name old hag) comes and sits on your chest. You have difficulty breathing and your sleep cycle becomes interrupted over and over again. Sometimes you feel that you cannot move. Sometimes you can see the old hag sitting on your chest from the slit of your eye, but can't do anything. Then when you wake up, you feel like going back to sleep because of, yes, lack of sleep.