We don't need to explain why getting your sleep is so important, do we? However, with so many of us being sleep deprived, it is no wonder that an estimated 40 million Americans suffer from a lack of sleep. That is a ghastly number. Lack of sleep causes mood disturbances, headaches, mood swings and it can really weaken the immune system. “People who are persistently sleep deprived are more likely to have high blood pressure and diabetes. Brain cells need a lot of oxygen and sugar, so blood flow problems could affect their ability to work properly," Harvard Health found. If you are tossing and turning and feel that experiencing good sleep is just for the lucky ones, that is not true. You might be unaware of how your own behavior may impact your sleep. The reasons that you might not be sleeping may be simple. Here are the 5 sleep mistakes that you are making.