For chronic insomniacs, especially if you are heavy snorer, it is a good idea to rule out Sleep Apnea as the cause. This is a serious condition that affects at least 12 million Americans, many of whom have not been diagnosed. Usually they are heavy snorers. What happens is that the tissues at the back of the throat relax and in so doing block the airways. The brain senses oxygen deprivation, and sends wakeup signals. There is a release of adrenaline and cortisol, the stress hormone. Not only does this interfere with sleep, it can increase blood pressure, raising your risk of heart problems and stroke. It can also interfere with insulin sensitivity, and increases your risk of diabetes.