During the sleep cycle its important to reach a dream state in order to get deep sleep. Its not important to remember the dreams you have but it is important to know that you are dreaming. If you do not remember reaching the dream state, you are most likely not producing enough serotonin. Studies of yogahave shown heightened serotonin levels. With the increase in serotonin production, you are apt to remember dreaming. Getting consistent deep sleep each night is important for health and can help reduce depressive symptoms.