Low Aldosterone level is often a sign of advance adrenal fatigue, while high aldosterone level points to mild adrenal weakness. Under normal circumstances, the level of this hormone is constantly being maintained for homeostasis 24/7. The seemingly diurnal pattern are more likely due to other factors including position, lymphatic, diet etc. Low sodium can cause a myriad of undesirable physiological response and insomnia is one of them. What confuses the picture more is the addition of paradoxical responses of the body as this is happening. Blood electroyles are usually normal and conventional medicine cannot explain the symptoms. Most of the time, titrating the amount of salt intake vs a vs fluid can be very helpful, but from time to time, a special class of steriods may be needed if the problem is too advance. If you are suspecting aldosterone issues, its best to seek someone who knows to help