Sleep
Melatonin is frequently used in alleviating sleeplessness. According to the Cognitive Enhancement Research Institute, dosages of 0.1 to 200 mg have been affirmed as effective to help individuals fall asleep. This also the same organization which reported that no unwanted side effects were observed even at high dosages. Based on the report of psychologist Courtney Ratzburg of Vanderbilt University, dosages of 1 to 5 mg are frequently used.
Immunity
As you sleep, the body’s immune system will strengthen by itself. Melatonin could also play a role in the immunity because it will help you stay and fall asleep. Ratzburg of Vanderbilt University wrote that cancers of the breast and prostate are associated with low levels of melatonin. She further reported that the symptoms of sarcoidosis could be safely treated with melatonin dosages of up to 20 mg on a daily basis.
Jet Lag
In 1992, Dr. Bruno Claustrat of Service de Radiopharmacie et Radioanalyse in France discovered that 8 mg of melatonin can improve the symptoms of jet lag over a placebo condition. The melatonin group has better mood, experienced easier time to fall asleep and became efficient the morning after flying. In 1993, another study reported by Dr. Apak Lino of Makerere reported that 5 mg of melatonin can improve jet lag symptoms. The study recommended that by taking dosages of 3 to 5 mg of melatonin for not more than two days after traveling can be helpful in alleviating jet lag.

Ask your doctor
I take 1 mg Melatonin at bed time.
I’m always tired, specially after 6 pm
My pulse is 58
I sleep 8 hour per night.
I’m 78 years old.
Should I discontinue taking Melatonin?
Thank you!