Melatonin is a natural supplement that signals your body it is time to go to sleep. By itself it can give you quite vivid dreams, but does not usually result in lucidity. On the nights that you take galantamine, it is recommend that you take melatonin 15-30 minutes before bedtime. This will help counter any wakefulness effect of galantamine, and will aid you in getting sufficient deep sleep during the first half of the night.
See my free Lucid Dreaming Supplements Guide.
Research has shown that melatonin is an important naturally occurring compound that may be helpful in adjusting the circadian rhythm when dealing with jet lag and other circadian rhythm sleep disorders and related problems. It is potentially radioprotective, and appears to enhance learning and memory. New research suggests that melatonin may have many potential benefits. Melatonin is a powerful antioxidant and may be potentially effective in the treatment of Alzheimers, delirium, aging (anti-aging geroprotector), ADHD, amyotrophic lateral sclerosis, autism spectrum disorders, some forms of insomnia, depression, seasonal affective disorder, periodic limb movement disorder, tinnuitis, migraines, cluster headaches, gastroesophageal reflux disease, drugs of abuse, cardiovascular diseases, gallbladder stones, irritable bowel syndrome, and various immune system disorders and acquired immunodeficiencies such as: infectious diseases, viral infections such as HIV, bacterial infections, and cancer.*
* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
The archived December 2013 Wikipedia article for “Melatonin” is suggested reading.