Melatonin contributes not only to uninterrupted sleep, but also to the quality of that sleep. In studies it even appeared to reduce the amount of sleep needed. Unlike traditional sleeping pills which disrupt sleep patterns and can leave individuals feeling unrested and anxious, melatonin appears to increase the amount of REM, deep sleep and dreaming, and to alleviate anxiety. Such healthy sleep patterns are particularly important to those who lead stressful lifestyles, as well as those who have a tendency towards depression. One of the most remarkable properties of melatonin may be its application in the fight against cancer.
Cancer patients appear to exhibit a significant reduction in melatonin productivity.
One study of prostate cancer patients showed melatonin levels reduced by as much as two thirds. In animal experiments supplementation of melatonin has been shown to inhibit the growth tumors. In addition melatonin seems to exert natural anti-estrogen properties. For this reason it may be of importance in countering estrogen-stimulated breast cancer growth. It may also be of use in other conditions associated with estrogen excess, such as uterine fibroids, endometriosis and premenstrual syndrome.