Melatonin assists your body's ability for healthy sleep. Melatonin is secreted in greater amounts at night and less during the day, thus your tendency to become sleepier at night. You and your health care provider may also use the information to monitor changes in melatonin levels affected by therapy and aging. Saliva screening is a simple, noninvasive way to determine your melatonin levels.
Research shows that the levels of hormones in saliva parallels levels of hormones in blood.